is-boolean

Determine if a value is Boolean

install

npm i @silen/is-boolean

api

• declare function isBoolean(val: any): boolean;

usage

const { isBoolean } = require('@silen/is-boolean');
// or
import { isBoolean } from '@silen/is-boolean';

console.log(isBoolean(new Buffer(4)));
console.log(isBoolean(Buffer.alloc(4)));
console.log(isBoolean(undefined));
console.log(isBoolean(null));
console.log(isBoolean(''));
console.log(isBoolean(true));
console.log(isBoolean(0));
console.log(isBoolean(1));
console.log(isBoolean(1.0));
console.log(isBoolean('string'));
console.log(isBoolean({}));
console.log(isBoolean(function foo() {}));
console.log(isBoolean(Symbol()));
console.log(isBoolean(new Set));
console.log(isBoolean(new Map));
console.log(isBoolean(new WeakMap));
console.log(isBoolean(new WeakSet));

// or
console.log(window.Type.isBoolean(new WeakSet));

This is a demo for testing the usage of isBoolean from @silen/is-boolean module. You can try the others and do likewise.

others

• type
• isArray
• isUndefined
• isNull
• isBuffer
• isArrayBuffer
• isFormData
• isArrayBufferView
• isString
• isNumber
• isObject
• isPlainObject
• isDate
• isArguments
• isFile
• isBlob
• isFunction
• isSymbol
• isRegExp
• isInt8Array
• isUint8Array
• isUint8ClampedArray
• isInt16Array
• isUint16Array
• isInt32Array
• isUint32Array
• isFloat32Array
• isFloat64Array
• isError
• isPromise
• isSet
• isWeakSet
• isMap
• isWeakMap
• isStream
• isURLSearchParams