get-callback

Get a callback function from arguments

Usage no npm install needed!

<script type="module">
  import getCallback from 'https://cdn.skypack.dev/get-callback';
</script>

README

get-callback.js

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Get a callback function from arguments

function printCallback() {
  var cb = getCallback(arguments);
  console.log(cb.toString());
}

printCallback('foo', {some: 'options'}, function cb(x, y) { return x + y; });

//yields: 'function cb(x, y) { return x + y; }'

This module is useful to create a function which takes a callback as its last argument.

Installation

Package managers

npm NPM version

npm install --save get-callback

bower Bower version

bower install --save get-callback

Standalone

Download the script file directly.

API

getCallback(args)

args: Array or array-like object (e.g. arguments)
Return: Function

It returns the last element of args, when the element is a function.

It throws an error when the last element is not a function.

function cb() {
  //... Something to do in the callback
}

(function() {
  getCallback(arguments); //=> [Function: cb]
})('foo', {some: 'options'}, cb);

License

Copyright (c) 2014 Shinnosuke Watanabe

Licensed under the MIT LIcense.