Promises when.js

by sporto

HTML

<script src="https://raw.github.com/cujojs/when/master/when.js"></script>
<script src="https://raw.github.com/caolan/async/master/dist/async.min.js"></script>

JavaScript

// using promises
function finder(records){
    var deferred = when.defer();
    setTimeout(function () {
        records.push(3, 4);
        deferred.resolve(records);
    }, 500);
    return deferred.promise;
}
function processor(records) {
     var deferred = when.defer();
    setTimeout(function () {
        records.push(5, 6);
        deferred.resolve(records);
    }, 500);
    return deferred.promise;
}

finder([1,2])
    .then(processor)
    .then(function(records) {
            alert(records);
    });