assert-is-function-x

assert-is-function-x

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

ECMAScript compatibility shims for legacy JavaScript engines

`es5-shim.js` monkey-patches a JavaScript context to contain all EcmaScript 5 methods that can be faithfully emulated with a legacy JavaScript engine.

es5-sham.js monkey-patches other ES5 methods as closely as possible. For these methods, as closely as possible to ES5 is not very close. Many of these shams are intended only to allow code to be written to ES5 without causing run-time errors in older engines. In many cases, this means that these shams cause many ES5 methods to silently fail. Decide carefully whether this is what you want. Note: es5-sham.js requires es5-shim.js to be able to work properly.

json3.js monkey-patches the EcmaScript 5 JSON implimentation faithfully.

es6.shim.js provides compatibility shims so that legacy JavaScript engines behave as closely as possible to ECMAScript 6 (Harmony).

Version: 1.0.2
Author: Xotic750 [e-mail]
License: MIT
Copyright: Xotic750

module.exports(callback) ⇒ * ⏏

Tests callback to see if it is a function, throws a TypeError if it is not. Otherwise returns the callback.

Kind: Exported function
Returns: * - Returns callback if it is function.
Throws:

• TypeError Throws if callback is not a function.

Param	Type	Description
callback	*	The argument to be tested.

Example

var assertIsFunction = require('assert-is-function-x');
var primitive = true;
var mySymbol = Symbol('mySymbol');
var symObj = Object(mySymbol);
var object = {};
function fn () {}

assertIsFunction(primitive);
   // TypeError 'true is not a function'.
assertIsFunction(object);
   // TypeError '#<Object> is not a function'.
assertIsFunction(mySymbol);
   // TypeError 'Symbol(mySymbol) is not a function'.
assertIsFunction(symObj);
   // TypeError '#<Object> is not a function'.
assertIsFunction(fn);
   // Returns fn.