npm:async-func | Skypack

README

This small module waits for an array/object of functions with a callback variable to be done and returns the results when all are done.

Example functionality:

var wait = require("async-func");

//Set a random number generator for the async functions
function rand(a, b) {
    return Math.floor(Math.random()*(b-a+1)+a);
}

//First example function
function examplefunc1(callback) {
    setTimeout(function() {
        callback("firstfuncdata");
    }, rand(1, 1000));
}

//Another example function
function test3(data, callback) {
    setTimeout(function() {
        callback(data);
    }, rand(1, 1000));
}

//An object version of a list of async calls
var calls = {
    //Call a normal async function
    data1: examplefunc1,
    //Call an anonymous async function
    data2: function(callback) {
        setTimeout(function() {
            callback("test2");
        }, rand(1, 1000));
    },
    //Call an async function that needs parameters
    data3: function(callback) {
        test3("datahere_data3", callback);
    },
    //Call an anonymous async function that needs parameters
    data4: function(callback) {
        var param = "datahere_data4";

        (function(data, subcallback) {
            setTimeout(function() {
                subcallback(data);
            }, rand(1, 1000));
        })(param, callback);
    }
};

//An array version of a list of async calls
var calls2 = [
    //Call a normal async function
    examplefunc1,
    //Call an anonymous async function
    function(callback) {
        setTimeout(function() {
            callback("test2");
        }, rand(1, 1000));
    },
    //Call an async function that needs parameters
    function(callback) {
        test3("datahere_data3", callback);
    },
    //Call an anonymous async function that needs parameters
    function(callback) {
        var param = "datahere_data4";

        (function(data, subcallback) {
            setTimeout(function() {
                subcallback(data);
            }, rand(1, 1000));
        })(param, callback);
    }
];

//Calls can even be combined with each other
var calls3 = [
    function(callback) {
        wait(calls, callback);
    },
    function(callback) {
        wait(calls2, callback);
    }
];

wait(calls3, function(data) {
    data = JSON.stringify(data, null, 4);
    console.log(data);
});

The resulting callback would log something like this:

[
    {
        "data3": "datahere_data3",
        "data2": "test2",
        "data4": "datahere_data4",
        "data1": "firstfuncdata"
    },
    [
        "firstfuncdata",
        "test2",
        "datahere_data3",
        "datahere_data4"
    ]
]

Usage no npm install needed!

README