Using the chaining asynchronous JavaScript calls with Angular JS

usingCallChain.js

function f1(callback) {
    console.log('f1');
    if (callback != null) {
        console.log('hasCallback');
        callback();
    }
}
function f2(callback) {
    console.log('f2');
    if (callback != null) {
        console.log('hasCallback');
        callback();
    }
}
function f3(callback) {
    console.log('f3');
    if (callback != null) {
        console.log('hasCallback');
        callback();
    }
}

var cc = callChain();
cc.add(f1);
cc.add(f2);
cc.add(f3);
cc.execute();