PromiseとDeferredの違い about promises-book HOT 5 CLOSED

var jqDeferred = Promise.resolve($.ajax('http://example.com/whatever.json'));

jqDeferred.then(function(response, statusText, xhrObj) {
  console.info("Success");
}, function(xhrObj, textStatus, err) {
   console.error(arguments);
});

"use strict";
function Deferred() {
    this.promise = new Promise(function (resolve, reject) {
        this._resolve = resolve;
        this._reject = reject;
    }.bind(this));
}
Deferred.prototype.resolve = function (value) {
    this._resolve.call(this.promise, value);
};
Deferred.prototype.reject = function (reason) {
    this._reject.call(this.promise, reason);
};

var deferred = new Deferred();
var promise = deferred.promise;
promise.then(function (value) {
    console.log(value);
}).catch(function(error){
    console.error(error);
});

deferred.resolve("Fulfilled！！！！");
// promiseは既にFulfilledになってるので、これは呼ばれない(catchは呼ばれない)
deferred.reject("doesn't called");