greencobalt / foreachcallback

Get a callback after your forEach is done!

forEach Callback

A simple package to add the forEachC property to all arrays that lets you perform an action on all elements of an array and then callback to a function when all are done.

Usage

require("foreachcallback");

let arr = [0, 1];
arr.forEachC((item, resolve, index) => {
	//do stuff here
	let done = item + 1;

	//resolve is the "return"
	resolve(done);
}, (results) => {
	//results = array of all results of stuff
	console.log(results);
});

//Expected result: [1, 2]

Examples / Explanation

let arr = [0, 1];
arr.forEachC((i, resolve, index) => {
    resolve(i + 1);
}, (results) => {
    console.log(results);
});

Expected Results:

[1, 2]

This might seem fairly useless compared to the default forEach, however where this is very useful is applications where you might not get a response immediately. For example, if you have an array of URLs:

let arr = ["https://google.com", "https://bing.com"];

It requires many lines of code to create all the promises to only continue execution when you've made a request to all of those. With this package, you can just:

arr.forEachC((i, resolve, index) => {
    request(i, function(error, request, body) {
		resolve(body);
	});
}, (results) => {
    console.log(results);
});

which will yield:

["<GOOGLE HTML>", "<BING HTML>"]