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@stdlib/assert

v0.3.3

Published

Standard assertion utilities.

Downloads

77,952

Readme

Assert

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]

Assertion utilities.

Installation

npm install @stdlib/assert

Usage

var assert = require( '@stdlib/assert' );

assert

Namespace providing utilities for data type testing and feature detection.

var o = assert;
// returns {...}

To validate the built-in JavaScript data types, the namespace includes the following assertion utilities:

  • [isArray( value )][@stdlib/assert/is-array]: test if a value is an array.
  • [isBoolean( value )][@stdlib/assert/is-boolean]: test if a value is a boolean.
  • [isDateObject( value )][@stdlib/assert/is-date-object]: test if a value is a Date object.
  • [isFunction( value )][@stdlib/assert/is-function]: test if a value is a function.
  • [isnan( value )][@stdlib/assert/is-nan]: test if a value is NaN.
  • [isNull( value )][@stdlib/assert/is-null]: test if a value is null.
  • [isNumber( value )][@stdlib/assert/is-number]: test if a value is a number.
  • [isObject( value )][@stdlib/assert/is-object]: test if a value is an object.
  • [isRegExp( value )][@stdlib/assert/is-regexp]: test if a value is a regular expression.
  • [isString( value )][@stdlib/assert/is-string]: test if a value is a string.
  • [isSymbol( value )][@stdlib/assert/is-symbol]: test if a value is a symbol.
  • [isUndefined( value )][@stdlib/assert/is-undefined]: test if a value is undefined.

For primitive types having corresponding object wrappers, assertion utilities provide isObject and isPrimitive methods to test for either objects or primitives, respectively.

var Boolean = require( '@stdlib/boolean/ctor' );
var isBoolean = require( '@stdlib/assert/is-boolean' );

var bool = isBoolean.isObject( new Boolean( false ) );
// returns true

bool = isBoolean.isObject( false );
// returns false

bool = isBoolean.isPrimitive( false );
// returns true

Many of the assertion utilities have corresponding packages that test whether array elements are of the given data type:

  • [isArrayArray( value )][@stdlib/assert/is-array-array]: test if a value is an array of arrays.
  • [isBooleanArray( value )][@stdlib/assert/is-boolean-array]: test if a value is an array-like object of booleans.
  • [isDateObjectArray( value )][@stdlib/assert/is-date-object-array]: test if a value is an array-like object containing only Date objects.
  • [isFunctionArray( value )][@stdlib/assert/is-function-array]: test if a value is an array-like object containing only functions.
  • [isNaNArray( value )][@stdlib/assert/is-nan-array]: test if a value is an array-like object containing only NaN values.
  • [isNullArray( value )][@stdlib/assert/is-null-array]: test if a value is an array-like object containing only null values.
  • [isNumberArray( value )][@stdlib/assert/is-number-array]: test if a value is an array-like object of numbers.
  • [isObjectArray( value )][@stdlib/assert/is-object-array]: test if a value is an array-like object containing only objects.
  • [isStringArray( value )][@stdlib/assert/is-string-array]: test if a value is an array of strings.
  • [isSymbolArray( value )][@stdlib/assert/is-symbol-array]: test if a value is an array-like object containing only symbols.

Where applicable, similar to the assertion utilities for built-in data types, array assertion utilities provides methods for testing for an array of primitives or objects.

var isStringArray = require( '@stdlib/assert/is-string-array' );

var bool = isStringArray( [ 'hello', 'world' ] );
// returns true

bool = isStringArray.primitives( [ 'hello', 'world' ] );
// returns true

bool = isStringArray.objects( [ 'hello', 'world' ] );
// returns false

bool = isStringArray.objects( [ new String( 'hello' ), new String( 'world' ) ] );
// returns true

The namespace also contains utilities to test for numbers within a certain range or for numbers satisfying a particular "type":

  • [isCubeNumber( value )][@stdlib/assert/is-cube-number]: test if a value is a cube number.
  • [isIntegerArray( value )][@stdlib/assert/is-integer-array]: test if a value is an array-like object containing only integers.
  • [isInteger( value )][@stdlib/assert/is-integer]: test if a value is a number having an integer value.
  • [isNegativeIntegerArray( value )][@stdlib/assert/is-negative-integer-array]: test if a value is an array-like object containing only negative integers.
  • [isNegativeInteger( value )][@stdlib/assert/is-negative-integer]: test if a value is a number having a negative integer value.
  • [isNegativeNumberArray( value )][@stdlib/assert/is-negative-number-array]: test if a value is an array-like object containing only negative numbers.
  • [isNegativeNumber( value )][@stdlib/assert/is-negative-number]: test if a value is a number having a negative value.
  • [isNonNegativeIntegerArray( value )][@stdlib/assert/is-nonnegative-integer-array]: test if a value is an array-like object containing only nonnegative integers.
  • [isNonNegativeInteger( value )][@stdlib/assert/is-nonnegative-integer]: test if a value is a number having a nonnegative integer value.
  • [isNonNegativeNumberArray( value )][@stdlib/assert/is-nonnegative-number-array]: test if a value is an array-like object containing only nonnegative numbers.
  • [isNonNegativeNumber( value )][@stdlib/assert/is-nonnegative-number]: test if a value is a number having a nonnegative value.
  • [isNonPositiveIntegerArray( value )][@stdlib/assert/is-nonpositive-integer-array]: test if a value is an array-like object containing only nonpositive integers.
  • [isNonPositiveInteger( value )][@stdlib/assert/is-nonpositive-integer]: test if a value is a number having a nonpositive integer value.
  • [isNonPositiveNumberArray( value )][@stdlib/assert/is-nonpositive-number-array]: test if a value is an array-like object containing only nonpositive numbers.
  • [isNonPositiveNumber( value )][@stdlib/assert/is-nonpositive-number]: test if a value is a number having a nonpositive value.
  • [isPositiveIntegerArray( value )][@stdlib/assert/is-positive-integer-array]: test if a value is an array-like object containing only positive integers.
  • [isPositiveInteger( value )][@stdlib/assert/is-positive-integer]: test if a value is a number having a positive integer value.
  • [isPositiveNumberArray( value )][@stdlib/assert/is-positive-number-array]: test if a value is an array-like object containing only positive numbers.
  • [isPositiveNumber( value )][@stdlib/assert/is-positive-number]: test if a value is a number having a positive value.
  • [isSafeIntegerArray( value )][@stdlib/assert/is-safe-integer-array]: test if a value is an array-like object containing only safe integers.
  • [isSafeInteger( value )][@stdlib/assert/is-safe-integer]: test if a value is a number having a safe integer value.
  • [isSquareNumber( value )][@stdlib/assert/is-square-number]: test if a value is a square number.
  • [isSquareTriangularNumber( value )][@stdlib/assert/is-square-triangular-number]: test if a value is a square triangular number.
  • [isTriangularNumber( value )][@stdlib/assert/is-triangular-number]: test if a value is a triangular number.

The namespace provides utilities for validating typed arrays:

  • [isFloat32Array( value )][@stdlib/assert/is-float32array]: test if a value is a Float32Array.
  • [isFloat64Array( value )][@stdlib/assert/is-float64array]: test if a value is a Float64Array.
  • [isInt16Array( value )][@stdlib/assert/is-int16array]: test if a value is an Int16Array.
  • [isInt32Array( value )][@stdlib/assert/is-int32array]: test if a value is an Int32Array.
  • [isInt8Array( value )][@stdlib/assert/is-int8array]: test if a value is an Int8Array.
  • [isUint16Array( value )][@stdlib/assert/is-uint16array]: test if a value is a Uint16Array.
  • [isUint32Array( value )][@stdlib/assert/is-uint32array]: test if a value is a Uint32Array.
  • [isUint8Array( value )][@stdlib/assert/is-uint8array]: test if a value is a Uint8Array.
  • [isUint8ClampedArray( value )][@stdlib/assert/is-uint8clampedarray]: test if a value is a Uint8ClampedArray.

The namespace includes utilities for validating ndarrays (n-dimensional arrays).

  • [isCentrosymmetricMatrix( value )][@stdlib/assert/is-centrosymmetric-matrix]: test if a value is a centrosymmetric matrix.
  • [isComplex128MatrixLike( value )][@stdlib/assert/is-complex128matrix-like]: test if a value is a 2-dimensional ndarray-like object containing double-precision complex floating-point numbers.
  • [isComplex128ndarrayLike( value )][@stdlib/assert/is-complex128ndarray-like]: test if a value is an ndarray-like object containing double-precision complex floating-point numbers.
  • [isComplex128VectorLike( value )][@stdlib/assert/is-complex128vector-like]: test if a value is a 1-dimensional ndarray-like object containing double-precision complex floating-point numbers.
  • [isComplex64MatrixLike( value )][@stdlib/assert/is-complex64matrix-like]: test if a value is a 2-dimensional ndarray-like object containing single-precision complex floating-point numbers.
  • [isComplex64ndarrayLike( value )][@stdlib/assert/is-complex64ndarray-like]: test if a value is an ndarray-like object containing single-precision complex floating-point numbers.
  • [isComplex64VectorLike( value )][@stdlib/assert/is-complex64vector-like]: test if a value is a 1-dimensional ndarray-like object containing single-precision complex floating-point numbers.
  • [isFloat32MatrixLike( value )][@stdlib/assert/is-float32matrix-like]: test if a value is a 2-dimensional ndarray-like object containing single-precision floating-point numbers.
  • [isFloat32ndarrayLike( value )][@stdlib/assert/is-float32ndarray-like]: test if a value is an ndarray-like object containing single-precision floating-point numbers.
  • [isFloat32VectorLike( value )][@stdlib/assert/is-float32vector-like]: test if a value is a 1-dimensional ndarray-like object containing single-precision floating-point numbers.
  • [isFloat64MatrixLike( value )][@stdlib/assert/is-float64matrix-like]: test if a value is a 2-dimensional ndarray-like object containing double-precision floating-point numbers.
  • [isFloat64ndarrayLike( value )][@stdlib/assert/is-float64ndarray-like]: test if a value is an ndarray-like object containing double-precision floating-point numbers.
  • [isFloat64VectorLike( value )][@stdlib/assert/is-float64vector-like]: test if a value is a 1-dimensional ndarray-like object containing double-precision floating-point numbers.
  • [isMatrixLike( value )][@stdlib/assert/is-matrix-like]: test if a value is 2-dimensional ndarray-like object.
  • [isndarrayLike( value )][@stdlib/assert/is-ndarray-like]: test if a value is ndarray-like.
  • [isNonSymmetricMatrix( value )][@stdlib/assert/is-nonsymmetric-matrix]: test if a value is a non-symmetric matrix.
  • [isPersymmetricMatrix( value )][@stdlib/assert/is-persymmetric-matrix]: test if a value is a persymmetric matrix.
  • [isSkewCentrosymmetricMatrix( value )][@stdlib/assert/is-skew-centrosymmetric-matrix]: test if a value is a skew-centrosymmetric matrix.
  • [isSkewPersymmetricMatrix( value )][@stdlib/assert/is-skew-persymmetric-matrix]: test if a value is a skew-persymmetric matrix.
  • [isSkewSymmetricMatrix( value )][@stdlib/assert/is-skew-symmetric-matrix]: test if a value is a skew-symmetric matrix.
  • [isSquareMatrix( value )][@stdlib/assert/is-square-matrix]: test if a value is a 2-dimensional ndarray-like object having equal dimensions.
  • [isSymmetricMatrix( value )][@stdlib/assert/is-symmetric-matrix]: test if a value is a symmetric matrix.
  • [isVectorLike( value )][@stdlib/assert/is-vector-like]: test if a value is a 1-dimensional ndarray-like object.

The namespace includes utilities for validating complex numbers and arrays of complex numbers:

  • [isComplexLike( value )][@stdlib/assert/is-complex-like]: test if a value is a complex number-like object.
  • [isComplexTypedArrayLike( value )][@stdlib/assert/is-complex-typed-array-like]: test if a value is complex-typed-array-like.
  • [isComplexTypedArray( value )][@stdlib/assert/is-complex-typed-array]: test if a value is a complex typed array.
  • [isComplex( value )][@stdlib/assert/is-complex]: test if a value is a 64-bit or 128-bit complex number.
  • [isComplex128( value )][@stdlib/assert/is-complex128]: test if a value is a 128-bit complex number.
  • [isComplex128Array( value )][@stdlib/assert/is-complex128array]: test if a value is a Complex128Array.
  • [isComplex64( value )][@stdlib/assert/is-complex64]: test if a value is a 64-bit complex number.
  • [isComplex64Array( value )][@stdlib/assert/is-complex64array]: test if a value is a Complex64Array.

The namespace includes utilities for validating other special arrays or buffers:

  • [isAccessorArray( value )][@stdlib/assert/is-accessor-array]: test if a value is an array-like object supporting the accessor (get/set) protocol.
  • [isArrayLength( value )][@stdlib/assert/is-array-length]: test if a value is a valid array length.
  • [isArrayLikeObject( value )][@stdlib/assert/is-array-like-object]: test if a value is an array-like object.
  • [isArrayLike( value )][@stdlib/assert/is-array-like]: test if a value is array-like.
  • [isArrayBufferView( value )][@stdlib/assert/is-arraybuffer-view]: test if a value is an ArrayBuffer view.
  • [isArrayBuffer( value )][@stdlib/assert/is-arraybuffer]: test if a value is an ArrayBuffer.
  • [isBetweenArray( value, a, b[, left, right] )][@stdlib/assert/is-between-array]: test if a value is an array-like object where every element is between two values.
  • [isBigInt64Array( value )][@stdlib/assert/is-bigint64array]: test if a value is a BigInt64Array.
  • [isBigUint64Array( value )][@stdlib/assert/is-biguint64array]: test if a value is a BigUint64Array.
  • [isCircularArray( value )][@stdlib/assert/is-circular-array]: test if a value is an array containing a circular reference.
  • [isEmptyArrayLikeObject( value )][@stdlib/assert/is-empty-array-like-object]: test if a value is an empty array-like object.
  • [isEmptyArray( value )][@stdlib/assert/is-empty-array]: test if a value is an empty array.
  • [isFalsyArray( value )][@stdlib/assert/is-falsy-array]: test if a value is an array-like object containing only falsy values.
  • [isFiniteArray( value )][@stdlib/assert/is-finite-array]: test if a value is an array-like object containing only finite numbers.
  • [isNumericArray( value )][@stdlib/assert/is-numeric-array]: test if a value is a numeric array.
  • [isPlainObjectArray( value )][@stdlib/assert/is-plain-object-array]: test if a value is an array-like object containing only plain objects.
  • [isProbabilityArray( value )][@stdlib/assert/is-probability-array]: test if a value is an array-like object containing only probabilities.
  • [isSameArray( v1, v2 )][@stdlib/assert/is-same-array]: test if two arguments are both generic arrays and have the same values.
  • [isSameComplex128Array( v1, v2 )][@stdlib/assert/is-same-complex128array]: test if two arguments are both Complex128Arrays and have the same values.
  • [isSameComplex64Array( v1, v2 )][@stdlib/assert/is-same-complex64array]: test if two arguments are both Complex64Arrays and have the same values.
  • [isSameFloat32Array( v1, v2 )][@stdlib/assert/is-same-float32array]: test if two arguments are both Float32Arrays and have the same values.
  • [isSameFloat64Array( v1, v2 )][@stdlib/assert/is-same-float64array]: test if two arguments are both Float64Arrays and have the same values.
  • [isSharedArrayBuffer( value )][@stdlib/assert/is-sharedarraybuffer]: test if a value is a SharedArrayBuffer.
  • [isTruthyArray( value )][@stdlib/assert/is-truthy-array]: test if a value is an array-like object containing only truthy values.
  • [isTypedArrayLength( value )][@stdlib/assert/is-typed-array-length]: test if a value is a valid typed array length.
  • [isTypedArrayLike( value )][@stdlib/assert/is-typed-array-like]: test if a value is typed-array-like.
  • [isTypedArray( value )][@stdlib/assert/is-typed-array]: test if a value is a typed array.
  • [isUnityProbabilityArray( value )][@stdlib/assert/is-unity-probability-array]: test if a value is an array of probabilities that sum to one.

To test for error objects, the namespace includes the following utilities:

  • [isError( value )][@stdlib/assert/is-error]: test if a value is an Error object.
  • [isEvalError( value )][@stdlib/assert/is-eval-error]: test if a value is an EvalError object.
  • [isRangeError( value )][@stdlib/assert/is-range-error]: test if a value is a RangeError object.
  • [isReferenceError( value )][@stdlib/assert/is-reference-error]: test if a value is a ReferenceError object.
  • [isSyntaxError( value )][@stdlib/assert/is-syntax-error]: test if a value is a SyntaxError object.
  • [isTypeError( value )][@stdlib/assert/is-type-error]: test if a value is a TypeError object.
  • [isURIError( value )][@stdlib/assert/is-uri-error]: test if a value is a URIError object.

The namespace exposes the following constants concerning the current running process:

  • [IS_BIG_ENDIAN][@stdlib/assert/is-big-endian]: check if an environment is big endian.
  • [IS_BROWSER][@stdlib/assert/is-browser]: check if the runtime is a web browser.
  • [IS_DARWIN][@stdlib/assert/is-darwin]: boolean indicating if the current process is running on Darwin.
  • [IS_DOCKER][@stdlib/assert/is-docker]: check if the process is running in a Docker container.
  • [IS_ELECTRON_MAIN][@stdlib/assert/is-electron-main]: check if the runtime is the main Electron process.
  • [IS_ELECTRON_RENDERER][@stdlib/assert/is-electron-renderer]: check if the runtime is the Electron renderer process.
  • [IS_ELECTRON][@stdlib/assert/is-electron]: check if the runtime is Electron.
  • [IS_LITTLE_ENDIAN][@stdlib/assert/is-little-endian]: check if an environment is little endian.
  • [IS_MOBILE][@stdlib/assert/is-mobile]: check if the current environment is a mobile device.
  • [IS_NODE][@stdlib/assert/is-node]: check if the runtime is Node.js.
  • [IS_TOUCH_DEVICE][@stdlib/assert/is-touch-device]: check if the current environment is a touch device.
  • [IS_WEB_WORKER][@stdlib/assert/is-web-worker]: check if the runtime is a web worker.
  • [IS_WINDOWS][@stdlib/assert/is-windows]: boolean indicating if the current process is running on Windows.

To test whether a runtime environment supports certain features, the namespace includes the following utilities:

  • [hasArrayBufferSupport()][@stdlib/assert/has-arraybuffer-support]: detect native ArrayBuffer support.
  • [hasArrowFunctionSupport()][@stdlib/assert/has-arrow-function-support]: detect native arrow function support.
  • [hasAsyncAwaitSupport()][@stdlib/assert/has-async-await-support]: detect native async/await support.
  • [hasAsyncIteratorSymbolSupport()][@stdlib/assert/has-async-iterator-symbol-support]: detect native Symbol.asyncIterator support.
  • [hasBigIntSupport()][@stdlib/assert/has-bigint-support]: detect native BigInt support.
  • [hasBigInt64ArraySupport()][@stdlib/assert/has-bigint64array-support]: detect native BigInt64Array support.
  • [hasBigUint64ArraySupport()][@stdlib/assert/has-biguint64array-support]: detect native BigUint64Array support.
  • [hasClassSupport()][@stdlib/assert/has-class-support]: detect native class support.
  • [hasDataViewSupport()][@stdlib/assert/has-dataview-support]: detect native DataView support.
  • [hasDefinePropertiesSupport()][@stdlib/assert/has-define-properties-support]: detect Object.defineProperties support.
  • [hasDefinePropertySupport()][@stdlib/assert/has-define-property-support]: detect Object.defineProperty support.
  • [hasFloat32ArraySupport()][@stdlib/assert/has-float32array-support]: detect native Float32Array support.
  • [hasFloat64ArraySupport()][@stdlib/assert/has-float64array-support]: detect native Float64Array support.
  • [hasFunctionNameSupport()][@stdlib/assert/has-function-name-support]: detect native function name support.
  • [hasGeneratorSupport()][@stdlib/assert/has-generator-support]: detect native generator function support.
  • [hasGlobalThisSupport()][@stdlib/assert/has-globalthis-support]: detect globalThis support.
  • [hasInt16ArraySupport()][@stdlib/assert/has-int16array-support]: detect native Int16Array support.
  • [hasInt32ArraySupport()][@stdlib/assert/has-int32array-support]: detect native Int32Array support.
  • [hasInt8ArraySupport()][@stdlib/assert/has-int8array-support]: detect native Int8Array support.
  • [hasIteratorSymbolSupport()][@stdlib/assert/has-iterator-symbol-support]: detect native Symbol.iterator support.
  • [hasMapSupport()][@stdlib/assert/has-map-support]: detect native Map support.
  • [hasNodeBufferSupport()][@stdlib/assert/has-node-buffer-support]: detect native Buffer support.
  • [hasProxySupport()][@stdlib/assert/has-proxy-support]: detect native Proxy support.
  • [hasSetSupport()][@stdlib/assert/has-set-support]: detect native Set support.
  • [hasSharedArrayBufferSupport()][@stdlib/assert/has-sharedarraybuffer-support]: detect native SharedArrayBuffer support.
  • [hasSymbolSupport()][@stdlib/assert/has-symbol-support]: detect native Symbol support.
  • [hasToStringTagSupport()][@stdlib/assert/has-tostringtag-support]: detect native Symbol.toStringTag support.
  • [hasUint16ArraySupport()][@stdlib/assert/has-uint16array-support]: detect native Uint16Array support.
  • [hasUint32ArraySupport()][@stdlib/assert/has-uint32array-support]: detect native Uint32Array support.
  • [hasUint8ArraySupport()][@stdlib/assert/has-uint8array-support]: detect native Uint8Array support.
  • [hasUint8ClampedArraySupport()][@stdlib/assert/has-uint8clampedarray-support]: detect native Uint8ClampedArray support.
  • [hasWebAssemblySupport()][@stdlib/assert/has-wasm-support]: detect native WebAssembly support.
  • [hasWeakMapSupport()][@stdlib/assert/has-weakmap-support]: detect native WeakMap support.
  • [hasWeakSetSupport()][@stdlib/assert/has-weakset-support]: detect native WeakSet support.

The remaining namespace utilities are as follows:

  • [contains( val, searchValue[, position] )][@stdlib/assert/contains]: test if an array-like value contains a search value.
  • [deepEqual( a, b )][@stdlib/assert/deep-equal]: test for deep equality between two values.
  • [deepHasOwnProp( value, path[, options] )][@stdlib/assert/deep-has-own-property]: test whether an object contains a nested key path.
  • [deepHasProp( value, path[, options] )][@stdlib/assert/deep-has-property]: test whether an object contains a nested key path, either own or inherited.
  • [hasOwnProp( value, property )][@stdlib/assert/has-own-property]: test if an object has a specified property.
  • [hasProp( value, property )][@stdlib/assert/has-property]: test if an object has a specified property, either own or inherited.
  • [hasUTF16SurrogatePairAt( string, position )][@stdlib/assert/has-utf16-surrogate-pair-at]: test if a position in a string marks the start of a UTF-16 surrogate pair.
  • [instanceOf( value, constructor )][@stdlib/assert/instance-of]: test whether a value has in its prototype chain a specified constructor as a prototype property.
  • [isAbsoluteHttpURI( value )][@stdlib/assert/is-absolute-http-uri]: test whether a value is an absolute HTTP(S) URI.
  • [isAbsolutePath( value )][@stdlib/assert/is-absolute-path]: test if a value is an absolute path.
  • [isAbsoluteURI( value )][@stdlib/assert/is-absolute-uri]: test whether a value is an absolute URI.
  • [isAccessorPropertyIn( value, property )][@stdlib/assert/is-accessor-property-in]: test if an object's own or inherited property has an accessor descriptor.
  • [isAccessorProperty( value, property )][@stdlib/assert/is-accessor-property]: test if an object's own property has an accessor descriptor.
  • [isAlphagram( value )][@stdlib/assert/is-alphagram]: test if a value is an alphagram.
  • [isAlphaNumeric( value )][@stdlib/assert/is-alphanumeric]: test whether a string contains only alphanumeric characters.
  • [isAnagram( str, value )][@stdlib/assert/is-anagram]: test if a value is an anagram.
  • [isArguments( value )][@stdlib/assert/is-arguments]: test if a value is an arguments object.
  • [isArrowFunction( value )][@stdlib/assert/is-arrow-function]: test if a value is an arrow function.
  • [isASCII( value )][@stdlib/assert/is-ascii]: test whether a character belongs to the ASCII character set and whether this is true for all characters in a provided string.
  • [isBetween( value, a, b[, left, right] )][@stdlib/assert/is-between]: test if a value is between two values.
  • [isBigInt( value )][@stdlib/assert/is-bigint]: test if a value is a BigInt.
  • [isBinaryString( value )][@stdlib/assert/is-binary-string]: test if a value is a binary string.
  • [isBlankString( value )][@stdlib/assert/is-blank-string]: test if a value is a blank string.
  • [isBoxedPrimitive( value )][@stdlib/assert/is-boxed-primitive]: test if a value is a JavaScript boxed primitive.
  • [isBuffer( value )][@stdlib/assert/is-buffer]: test if a value is a Buffer object.
  • [isCamelcase( value )][@stdlib/assert/is-camelcase]: test if a value is a camelcase string.
  • [isCapitalized( value )][@stdlib/assert/is-capitalized]: test if a value is a string having an uppercase first character.
  • [isCircular( value )][@stdlib/assert/is-circular]: test if a value is a plain object containing a circular reference.
  • [isCircular( value )][@stdlib/assert/is-circular]: test if an object-like value contains a circular reference.
  • [isClass( value )][@stdlib/assert/is-class]: test if a value is a class.
  • [isCollection( value )][@stdlib/assert/is-collection]: test if a value is a collection.
  • [isComposite( value )][@stdlib/assert/is-composite]: test if a value is a composite number.
  • [isConfigurablePropertyIn( value, property )][@stdlib/assert/is-configurable-property-in]: test if an object's own or inherited property is configurable.
  • [isConfigurableProperty( value, property )][@stdlib/assert/is-configurable-property]: test if an object's own property is configurable.
  • [isConstantcase( value )][@stdlib/assert/is-constantcase]: test if a value is a constantcase string.
  • [isCurrentYear( value )][@stdlib/assert/is-current-year]: test if a value is the current year.
  • [isDataPropertyIn( value, property )][@stdlib/assert/is-data-property-in]: test if an object's own or inherited property has a data descriptor.
  • [isDataProperty( value, property )][@stdlib/assert/is-data-property]: test if an object's own property has a data descriptor.
  • [isDataView( value )][@stdlib/assert/is-dataview]: test if a value is a DataView.
  • [isDigitString( value )][@stdlib/assert/is-digit-string]: test whether a string contains only numeric digits.
  • [isDomainName( value )][@stdlib/assert/is-domain-name]: test if a value is a domain name.
  • [isDurationString( value )][@stdlib/assert/is-duration-string]: test if a value is a duration string.
  • [isEmailAddress( value )][@stdlib/assert/is-email-address]: test if a value is an email address.
  • [isEmptyCollection( value )][@stdlib/assert/is-empty-collection]: test if a value is an empty collection.
  • [isEmptyObject( value )][@stdlib/assert/is-empty-object]: test if a value is an empty object.
  • [isEmptyString( value )][@stdlib/assert/is-empty-string]: test if a value is an empty string.
  • [isEnumerablePropertyIn( value, property )][@stdlib/assert/is-enumerable-property-in]: test if an object's own or inherited property is enumerable.
  • [isEnumerableProperty( value, property )][@stdlib/assert/is-enumerable-property]: test if an object's own property is enumerable.
  • [isEven( value )][@stdlib/assert/is-even]: test if a value is an even number.
  • [isFalsy( value )][@stdlib/assert/is-falsy]: test if a value is falsy.
  • [isFinite( value )][@stdlib/assert/is-finite]: test if a value is a finite number.
  • [isGeneratorObjectLike( value )][@stdlib/assert/is-generator-object-like]: test if a value is generator object-like.
  • [isGeneratorObject( value )][@stdlib/assert/is-generator-object]: test if a value is a generator object.
  • [isgzipBuffer( value )][@stdlib/assert/is-gzip-buffer]: test if a value is a gzip buffer.
  • [isHexString( value )][@stdlib/assert/is-hex-string]: test whether a string contains only hexadecimal digits.
  • [isInfinite( value )][@stdlib/assert/is-infinite]: test if a value is an infinite number.
  • [isInheritedProperty( value, property )][@stdlib/assert/is-inherited-property]: test if an object has an inherited property.
  • [isIterableLike( value )][@stdlib/assert/is-iterable-like]: test if a value is iterable-like.
  • [isIteratorLike( value )][@stdlib/assert/is-iterator-like]: test if a value is iterator-like.
  • [isJSON( value )][@stdlib/assert/is-json]: test if a value is a parseable JSON string.
  • [isKebabcase( value )][@stdlib/assert/is-kebabcase]: test if a value is a string in kebab case.
  • [isLeapYear( [value] )][@stdlib/assert/is-leap-year]: test if a value corresponds to a leap year in the Gregorian calendar.
  • [isLocalhost( value )][@stdlib/assert/is-localhost]: test whether a value is a localhost hostname.
  • [isLowercase( value )][@stdlib/assert/is-lowercase]: test if a value is a lowercase string.
  • [isMethodIn( value, property )][@stdlib/assert/is-method-in]: test if an object has a specified method name, either own or inherited.
  • [isMethod( value, property )][@stdlib/assert/is-method]: test if an object has a specified method name.
  • [isMultiSlice( value )][@stdlib/assert/is-multi-slice]: test if a value is a MultiSlice.
  • [isNamedTypedTupleLike( value )][@stdlib/assert/is-named-typed-tuple-like]: test if a value is named typed tuple-like.
  • [isNativeFunction( value )][@stdlib/assert/is-native-function]: test if a value is a native function.
  • [isNegativeZero( value )][@stdlib/assert/is-negative-zero]: test if a value is a number equal to negative zero.
  • [isNodeBuiltin( value )][@stdlib/assert/is-node-builtin]: test whether a string matches a Node.js built-in module name.
  • [isNodeDuplexStreamLike( value )][@stdlib/assert/is-node-duplex-stream-like]: test if a value is Node duplex stream-like.
  • [isNodeReadableStreamLike( value )][@stdlib/assert/is-node-readable-stream-like]: test if a value is Node readable stream-like.
  • [isNodeREPL()][@stdlib/assert/is-node-repl]: check if running in a Node.js REPL environment.
  • [isNodeStreamLike( value )][@stdlib/assert/is-node-stream-like]: test if a value is Node stream-like.
  • [isNodeTransformStreamLike( value )][@stdlib/assert/is-node-transform-stream-like]: test if a value is Node transform stream-like.
  • [isNodeWritableStreamLike( value )][@stdlib/assert/is-node-writable-stream-like]: test if a value is Node writable stream-like.
  • [isNonConfigurablePropertyIn( value, property )][@stdlib/assert/is-nonconfigurable-property-in]: test if an object's own or inherited property is non-configurable.
  • [isNonConfigurableProperty( value, property )][@stdlib/assert/is-nonconfigurable-property]: test if an object's own property is non-configurable.
  • [isNonEnumerablePropertyIn( value, property )][@stdlib/assert/is-nonenumerable-property-in]: test if an object's own or inherited property is non-enumerable.
  • [isNonEnumerableProperty( value, property )][@stdlib/assert/is-nonenumerable-property]: test if an object's own property is non-enumerable.
  • [isNonNegativeFinite( value )][@stdlib/assert/is-nonnegative-finite]: test if a value is a number having a nonnegative finite value.
  • [isObjectLike( value )][@stdlib/assert/is-object-like]: test if a value is object-like.
  • [isOdd( value )][@stdlib/assert/is-odd]: test if a value is an odd number.
  • [isPascalcase( value )][@stdlib/assert/is-pascalcase]: test if a value is a string in Pascal case.
  • [isPlainObject( value )][@stdlib/assert/is-plain-object]: test if a value is a plain object.
  • [isPositiveZero( value )][@stdlib/assert/is-positive-zero]: test if a value is a number equal to positive zero.
  • [isPrime( value )][@stdlib/assert/is-prime]: test if a value is a prime number.
  • [isPrimitive( value )][@stdlib/assert/is-primitive]: test if a value is a JavaScript primitive.
  • [isPRNGLike( value )][@stdlib/assert/is-prng-like]: test if a value is PRNG-like.
  • [isProbability( value )][@stdlib/assert/is-probability]: test if a value is a probability.
  • [isPropertyKey( value )][@stdlib/assert/is-property-key]: test whether a value is a property key.
  • [isPrototypeOf( obj, prototype )][@stdlib/assert/is-prototype-of]: test if an object's prototype chain contains a provided prototype.
  • [isReadOnlyPropertyIn( value, property )][@stdlib/assert/is-read-only-property-in]: test if an object's own or inherited property is read-only.
  • [isReadOnlyProperty( value, property )][@stdlib/assert/is-read-only-property]: test if an object's own property is read-only.
  • [isReadWritePropertyIn( value, property )][@stdlib/assert/is-read-write-property-in]: test if an object's own or inherited property is readable and writable.
  • [isReadWriteProperty( value, property )][@stdlib/assert/is-read-write-property]: test if an object's own property is readable and writable.
  • [isReadablePropertyIn( value, property )][@stdlib/assert/is-readable-property-in]: test if an object's own or inherited property is readable.
  • [isReadableProperty( value, property )][@stdlib/assert/is-readable-property]: test if an object's own property is readable.
  • [isRegExpString( value )][@stdlib/assert/is-regexp-string]: test if a value is a regular expression string.
  • [isRelativePath( value )][@stdlib/assert/is-relative-path]: test if a value is a relative path.
  • [isRelativeURI( value )][@stdlib/assert/is-relative-uri]: test whether a value is a relative URI.
  • [isSameComplex128( v1, v2 )][@stdlib/assert/is-same-complex128]: test if two arguments are both double-precision complex floating-point numbers and have the same value.
  • [isSameComplex64( v1, v2 )][@stdlib/assert/is-same-complex64]: test if two arguments are both single-precision complex floating-point numbers and have the same value.
  • [isSameNativeClass( a, b )][@stdlib/assert/is-same-native-class]: test if two arguments have the same native class.
  • [isSameType( a, b )][@stdlib/assert/is-same-type]: test if two arguments have the same type.
  • [isSameValueZero( a, b )][@stdlib/assert/is-same-value-zero]: test if two arguments are the same value.
  • [isSameValue( a, b )][@stdlib/assert/is-same-value]: test if two arguments are the same value.
  • [`isS