Deferred/Promise Sample

deferred.js

function a(){
  var d1=$.Deferred();
  _.defer(function(){
    console.log("a executed");
    d1.resolve("resolved");
    //d1.reject("reject");
  },500);
  
  d1.pipe(function successPipe(){
    console.log("local pipe");
  });

  return d1.promise();
}

a().pipe(function(value){
  console.log("a pipe: "+value);
  return "pipe"
}).then(function(value){
  console.log("a then1: "+value);
  return "then1"
}).then(function(value){
  console.log("a then2: "+value);
  return "then2"
}).done(function(value){
  console.log("a resolved: "+value);
  return "done";
}).fail(function(value){
  console.log("a failed: "+value);
});

var d1 = $.Deferred();
var d2 = $.Deferred();
var d3 = $.Deferred();

$.when( d1, d2, d3 ).done(function ( v1, v2, v3 ) {
    console.log( v1 ); // v1 is undefined
    console.log( v2 ); // v2 is "abc"
    console.log( v3 ); // v3 is an array [ 1, 2, 3, 4, 5 ]
});
 
d1.resolve();
d2.resolve( "abc" );
d3.resolve( 1, 2, 3, 4, 5 );