is-function

Determine if a value is Function

install

npm i @silen/is-function

api

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

usage

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

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

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

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

others

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