assert-is-function-x

assert-is-function-x

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

Version: 1.2.0
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.