is that thing a function? Use this module to find out

type checking: is.array, is.arguments, is.function, is.string, is.number, is.date, is.regexp, is.object

TypeScript definitions for is-function

check if an AST node is a function of some sort

Test if a value is a function.

Simple function test

A type checking library where each exported function returns either true or false and does not throw. Also added tests.

Determine whether a given value is a function object.

Test whether a given value is a function.

is-function function part of http://amp.ampersandjs.com.

If isFunction(callbackfn) is false, throw a TypeError exception.

一些检查方法

A tiny type checker

Validatem validator for ensuring that a value is a function

Test if a value is an array-like object containing only functions.

Shared utilities for browsers and Node.js

Check if a value's a function.

Do checking...

A lightweight JavaScript utility library with common functions

判断当前值是否为函数