Promises using when.js

example.js

function finder(records){
    // instance of when.defer method
    var deferred = when.defer();
    setTimeout(function () {
        records.push(3, 4);
        
        // save result
        deferred.resolve(records);
    }, 500);

    // expose result
    return deferred.promise;
}

function processor(records) {
    // instance of when.defer method
    var deferred = when.defer();
    setTimeout(function () {
        records.push(5, 6);
        
        // save result
        deferred.resolve(records);
    }, 500);
    
    // expose result
    return deferred.promise;
}

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