NodeJS Async WaterFall Example

async_waterfall_example.js

var async = require('async');

async.waterfall(
    [
        function(callback) {
            callback(null, 'Yes', 'it');
        },
        function(arg1, arg2, callback) {
            var caption = arg1 +' and '+ arg2;
            callback(null, caption);
        },
        function(caption, callback) {
            caption += ' works!';
            callback(null, caption);
        }
    ],
    function (err, caption) {
        console.log(caption);
        // Node.js and JavaScript Rock!
    }
);

//## Another Way

var secondCallBack = function(arg1, arg2) {
        var caption = arg1 +' and '+ arg2;
        thirdCallBack(caption);
}
var thirdCallBack  = function(caption) {
        caption += ' works!';
        finalCallBack(null, caption);
}
var finalCallBack = function (err, caption) {
        console.log(caption);
        // Node.js and JavaScript Rock!
}
async.waterfall(
    [
        function(callback) {
            secondCallBack('Yes', 'it');
        },
        secondCallBack
        ,
        thirdCallBack
    ],
    finalCallBack
    
);