asyncLoop.js

A single method to handle iterating through arrays and running asynchronous functions every iteration.

Installation

1. Clone or download repository and copy asyncLoop.js file into your project.

Parameters

data : array

The array to be looped through

iterationCallback : function(item, next, exit)

The function that will be called during every iteration of the loop. This will be where you add your asynchronous actions.

When you have finished with your action, next(); needs to be called to go to the next iteration. If you want to exit the loop, exit(); can be called also.

finishedCallback

This function will be called when the loop has iteration through all the items in the array that was passed as the first parameter.

Usage

const asyncLoop = require('./asyncLoop');

var myArray = ['Apples', 'Grapes', 'Bananas', 'Oranges' ];

asyncLoop(myArray, (item, next, exit) => {
    
    //Call exit(); to exit loop early

    //Run asynchronous function
    setTimeout(function() {
        console.log(item);
        //Call next to run next iteration
        next();
    }, 1000);

}, () => {

    console.log('FINISHED');
    process.exit(0);

});

or

index.html

<script src="/path/to/js/asyncLoop.js"></script>
<script src="/path/to/js/myScript.js"></script>

myScript.js

var myArray = ['Apples', 'Grapes', 'Bananas', 'Oranges' ];

asyncLoop(myArray, function(item, next, exit) {
    
    //Call exit(); to exit loop early

    //Run asynchronous function
    setTimeout(function() {
        console.log(item);
        //Call next to run next iteration
        next();
    }, 1000);

}, function() => {

    console.log('FINISHED');

});