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authorRyan Johnson <rjohnson@mozilla.com>2021-04-29 16:16:42 -0700
committerGitHub <noreply@github.com>2021-04-29 16:16:42 -0700
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----
-title: Array.prototype.findIndex()
-slug: Web/JavaScript/Reference/Global_Objects/Array/findIndex
-translation_of: Web/JavaScript/Reference/Global_Objects/Array/findIndex
----
-<div>{{JSRef}}</div>
-
-<p>FindIndex () yöntemi, sağlanan test işlevini karşılayan dizideki ilk öğenin dizinini döndürür. Aksi takdirde -1 iade edilir.</p>
-
-<div>{{EmbedInteractiveExample("pages/js/array-findindex.html")}}</div>
-
-<p class="hidden">Bu interaktif örneğin için kaynak bir GitHub deposunda saklanır. Etkileşimli örnek projesine katkıda bulunmak isterseniz, lütfen https://github.com/mdn/interactive-examples klonlayın ve bize bir çekme isteği gönderin.</p>
-
-<div> </div>
-
-<p>Ayrıca, dizinde bulunan dizinin yerine bulunan bir öğenin değerini döndüren {{jsxref ("Array.find", "find ()")}} yöntemine de bakın.</p>
-
-<h2 id="Syntax">Syntax</h2>
-
-<pre class="syntaxbox"><var>arr</var>.findIndex(<var>callback</var>[, <var>thisArg</var>])</pre>
-
-<h3 id="Parameters">Parameters</h3>
-
-<dl>
- <dt><code>callback</code></dt>
- <dd>Function to execute on each value in the array, taking three arguments:
- <dl>
- <dt><code>element</code></dt>
- <dd>The current element being processed in the array.</dd>
- <dt><code>index</code>{{optional_inline}}</dt>
- <dd>The index of the current element being processed in the array.</dd>
- <dt><code>array</code>{{optional_inline}}</dt>
- <dd>The array <code>findIndex</code> was called upon.</dd>
- </dl>
- </dd>
- <dt><code>thisArg</code>{{optional_inline}}</dt>
- <dd>Optional. Object to use as <code>this</code> when executing <code>callback</code>.</dd>
-</dl>
-
-<h3 id="Return_value">Return value</h3>
-
-<p>An index in the array if an element passes the test; otherwise, <strong>-1</strong>.</p>
-
-<h2 id="Description">Description</h2>
-
-<p>The <code>findIndex</code> method executes the <code>callback</code> function once for every array index <code>0..length-1</code> (inclusive) in the array until it finds one where <code>callback</code> returns a truthy value (a value that coerces to <code>true</code>). If such an element is found, <code>findIndex</code> immediately returns the index for that iteration. If the callback never returns a truthy value or the array's <code>length</code> is 0, <code>findIndex</code> returns -1. Unlike some other array methods such as Array#some, in sparse arrays the <code>callback</code> <strong>is</strong> called even for indexes of entries not present in the array.</p>
-
-<p><code>callback</code> is invoked with three arguments: the value of the element, the index of the element, and the Array object being traversed.</p>
-
-<p>If a <code>thisArg</code> parameter is provided to <code>findIndex</code>, it will be used as the <code>this</code> for each invocation of the <code>callback</code>. If it is not provided, then {{jsxref("undefined")}} is used.</p>
-
-<p><code>findIndex</code> does not mutate the array on which it is called.</p>
-
-<p>The range of elements processed by <code>findIndex</code> is set before the first invocation of <code>callback</code>. Elements that are appended to the array after the call to <code>findIndex</code> begins will not be visited by <code>callback</code>. If an existing, unvisited element of the array is changed by <code>callback</code>, its value passed to the visiting <code>callback</code> will be the value at the time that <code>findIndex</code> visits that element's index; elements that are deleted are still visited.</p>
-
-<h2 id="Examples">Examples</h2>
-
-<h3 id="Find_the_index_of_a_prime_number_in_an_array">Find the index of a prime number in an array</h3>
-
-<p>The following example finds the index of an element in the array that is a prime number (or returns -1 if there is no prime number).</p>
-
-<pre class="brush: js">function isPrime(element, index, array) {
- var start = 2;
- while (start &lt;= Math.sqrt(element)) {
- if (element % start &lt; 1) {
- return false;
- } else {
-  start++;
-  }
- }
- return element &gt; 1;
-}
-
-console.log([4, 6, 8, 12].findIndex(isPrime)); // -1, not found
-console.log([4, 6, 7, 12].findIndex(isPrime)); // 2
-</pre>
-
-<h3 id="Find_index_using_arrow_function">Find index using arrow function</h3>
-
-<p>The following example finds the index of a fruit using an arrow function.</p>
-
-<pre class="brush: js">const fruits = ["apple", "banana", "cantaloupe", "blueberries", "grapefruit"];
-
-const index = fruits.findIndex(fruit =&gt; fruit === "blueberries");
-
-console.log(index); // 3
-console.log(fruits[index]); // blueberries
-</pre>
-
-<h2 id="Polyfill">Polyfill</h2>
-
-<pre class="brush: js">// https://tc39.github.io/ecma262/#sec-array.prototype.findIndex
-if (!Array.prototype.findIndex) {
- Object.defineProperty(Array.prototype, 'findIndex', {
- value: function(predicate) {
- // 1. Let O be ? ToObject(this value).
- if (this == null) {
- throw new TypeError('"this" is null or not defined');
- }
-
- var o = Object(this);
-
- // 2. Let len be ? ToLength(? Get(O, "length")).
- var len = o.length &gt;&gt;&gt; 0;
-
- // 3. If IsCallable(predicate) is false, throw a TypeError exception.
- if (typeof predicate !== 'function') {
- throw new TypeError('predicate must be a function');
- }
-
- // 4. If thisArg was supplied, let T be thisArg; else let T be undefined.
- var thisArg = arguments[1];
-
- // 5. Let k be 0.
- var k = 0;
-
- // 6. Repeat, while k &lt; len
- while (k &lt; len) {
- // a. Let Pk be ! ToString(k).
- // b. Let kValue be ? Get(O, Pk).
- // c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).
- // d. If testResult is true, return k.
- var kValue = o[k];
- if (predicate.call(thisArg, kValue, k, o)) {
- return k;
- }
- // e. Increase k by 1.
- k++;
- }
-
- // 7. Return -1.
- return -1;
- },
- configurable: true,
- writable: true
- });
-}
-</pre>
-
-<p>If you need to support truly obsolete JavaScript engines that don't support <code><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty">Object.defineProperty</a></code>, it's best not to polyfill <code>Array.prototype</code> methods at all, as you can't make them non-enumerable.</p>
-
-<h2 id="Specifications">Specifications</h2>
-
-<table class="standard-table">
- <tbody>
- <tr>
- <th scope="col">Specification</th>
- <th scope="col">Status</th>
- <th scope="col">Comment</th>
- </tr>
- <tr>
- <td>{{SpecName('ES2015', '#sec-array.prototype.findindex', 'Array.prototype.findIndex')}}</td>
- <td>{{Spec2('ES2015')}}</td>
- <td>Initial definition.</td>
- </tr>
- <tr>
- <td>{{SpecName('ESDraft', '#sec-array.prototype.findIndex', 'Array.prototype.findIndex')}}</td>
- <td>{{Spec2('ESDraft')}}</td>
- <td> </td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="Browser_compatibility">Browser compatibility</h2>
-
-<div>
-
-
-<p>{{Compat("javascript.builtins.Array.findIndex")}}</p>
-</div>
-
-<h2 id="See_also">See also</h2>
-
-<ul>
- <li>{{jsxref("Array.prototype.find()")}}</li>
- <li>{{jsxref("Array.prototype.indexOf()")}}</li>
-</ul>