assert-is-function-x
v3.1.2
If isFunction(callbackfn) is false, throw a TypeError exception.
1.0K/weekUpdated 3 years agoMITUnpacked: 189.3 KB
Published by Graham Fairweather
npm install assert-is-function-x
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assert-is-function-x
If isFunction(callbackfn) is false, throw a TypeError exception.
$3
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. |
| [message] | string | Optional alternative message. |
Example
``js
import assertIsFunction from 'assert-is-function-x';
const primitive = true;
const mySymbol = Symbol('mySymbol');
const symObj = Object(mySymbol);
const object = {};
const fn = function fn() {};
assertIsFunction(primitive); // TypeError 'true is not a function'.
assertIsFunction(object); // TypeError '#