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----
-title: Promise.prototype.then()
-slug: Web/JavaScript/Reference/Global_Objects/Promise/then
-tags:
- - ECMAScript6
- - JavaScript
- - Method
- - Promise
- - Prototype
- - Referensi
-translation_of: Web/JavaScript/Reference/Global_Objects/Promise/then
----
-<div>{{JSRef}}</div>
-
-<p>Method <code><strong>then()</strong></code> mengembalikan {{domxref("Promise")}}. Menggunakan dua argumen: fungsi callback untuk kasus sukses dan gagal pada <code>Promise</code>.</p>
-
-<h2 id="Sintaks">Sintaks</h2>
-
-<pre class="syntaxbox"><var>p.then(onFulfilled, onRejected)</var>;
-
-p.then(function(value) {
- // fulfillment
- }, function(reason) {
- // rejection
-});
-</pre>
-
-<h3 id="Parameter">Parameter</h3>
-
-<dl>
- <dt><code>onFulfilled</code></dt>
- <dd>{{jsxref("Function")}} dipanggil ketika <code>Promise</code> dipenuhi. Fungsi ini memiliki satu argumen, <code>value pemenuhan</code>.</dd>
- <dt><code>onRejected</code></dt>
- <dd>{{jsxref("Function")}} dipangil ketika <code>Promise</code> ditolak. fungsi ini memiliki satau argumen, alasan penolakan.</dd>
-</dl>
-
-<h2 id="Deskripsi">Deskripsi</h2>
-
-<p>Kedua method <code>then</code> dan {{jsxref("Promise.prototype.catch()")}} megembalikan promis, juga dapat dirantaikan — operasi yang disebut <em>composition</em>.</p>
-
-<h2 id="Contoh">Contoh</h2>
-
-<h3 id="Meggunakan_method_then">Meggunakan method <code>then</code></h3>
-
-<pre class="brush: js">var p1 = new Promise(function(resolve, reject) {
- resolve("Success!");
- // or
- // reject ("Error!");
-});
-
-p1.then(function(value) {
- console.log(value); // Success!
-}, function(reason) {
- console.log(reason); // Error!
-});
-</pre>
-
-<h3 id="Perantaian">Perantaian</h3>
-
-<p>Karena method <code>then</code> mengembalikan <code>Promise</code>, anda bisa merantaikan pemanggilan <code>then</code>.</p>
-
-<pre class="brush: js">var p2 = new Promise(function(resolve, reject) {
- resolve(1);
-});
-
-p2.then(function(value) {
- console.log(value); // 1
- return value + 1;
-}).then(function(value) {
- console.log(value); // 2
-});
-
-p2.then(function(value) {
- console.log(value); // 1
-});
-</pre>
-
-<p>Anda juga bisa menggunakan perantaian untuk melaksanakan satu fungsi dengan sebuah Promise berbasis API diatas fungsi lainnya.</p>
-
-<pre class="brush: js">function fetch_current_data() {
- // The <a href="/en-US/docs/Web/API/GlobalFetch/fetch">fetch</a>() API returns a Promise. This function
- // exposes a similar API, except the fulfillment
- // value of this function's Promise has had more
- // work done on it.
- return fetch("current-data.json").then((response) =&gt; {
- if (response.headers.get("content-type") != "application/json") {
- throw new TypeError();
- }
- var j = response.json();
- // maybe do something with j
- return j; // fulfillment value given to user of
- // fetch_current_data().then()
- });
-}
-</pre>
-
-<h2 id="Spesifikasi">Spesifikasi</h2>
-
-<table class="standard-table">
- <tbody>
- <tr>
- <th scope="col">Spesifikasi</th>
- <th scope="col">Status</th>
- <th scope="col">Comment</th>
- </tr>
- <tr>
- <td>{{SpecName('ES6', '#sec-promise.prototype.then', 'Promise.prototype.then')}}</td>
- <td>{{Spec2('ES6')}}</td>
- <td>Initial definition in an ECMA standard.</td>
- </tr>
- <tr>
- <td>{{SpecName('ESDraft', '#sec-promise.prototype.then', 'Promise.prototype.then')}}</td>
- <td>{{Spec2('ESDraft')}}</td>
- <td> </td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="Kompabilitas_Browser">Kompabilitas Browser</h2>
-
-<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
-
-<p>{{Compat("javascript.builtins.Promise.then")}}</p>
-
-<p> </p>
-
-<h2 id="Lihat_juga">Lihat juga</h2>
-
-<ul>
- <li>{{jsxref("Promise")}}</li>
- <li>{{jsxref("Promise.prototype.catch()")}}</li>
-</ul>