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+---
+title: String.prototype.indexOf()
+slug: Web/JavaScript/Reference/Global_Objects/String/indexOf
+translation_of: Web/JavaScript/Reference/Global_Objects/String/indexOf
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>indexOf()</code></strong> method mengembalikan sebuah <em>index</em> saat memanggil objek  {{jsxref("String")}} pertama kali dengan <em>value </em>yang di tentukan, bermula dari pencarian pada <em><code>fromIndex</code></em>. Dan pencarian ini akan mengembalikan index dari karakter pada String,  dan akan mengembalikan <em>-1</em> ketika pencarian <em>indexOf </em>ini tak menemukan karakter yang cocok/ value yang sesuai.</p>
+
+<h2 id="Syntax">Syntax</h2>
+
+<pre class="syntaxbox"><code><var>str</var>.indexOf(<var>searchValue</var>[, <var>fromIndex</var>]</code>)</pre>
+
+<h3 id="Parameters">Parameters</h3>
+
+<dl>
+ <dt><code>searchValue</code></dt>
+ <dd>Sebuah string yang me-representasikan dari nilai yang ingin di cari.</dd>
+ <dt><code>fromIndex</code> {{optional_inline}}</dt>
+ <dd>Index bermulai dari awal hingga bergerak ke depan sepanjang string. Index bisa berupa bilangan bulat atau apa pun. Nilai standarnya adalah <code>0</code>, jadi seluruh index dari array akan dicari. Jika <code>fromIndex &lt; 0</code> seluruh string dicari. Jika <code>fromIndex &gt;= str.length</code>, string tidak dicari dan <code>-1</code> sebagai kembaliannya. Kecuali kalau <code>searchValue</code> adalah string kosong, maka <code>str.length</code> sebagai kembaliannya.</dd>
+</dl>
+
+<h2 id="Deskripsi">Deskripsi</h2>
+
+<p>Karakter dalam sebuah <em>string</em> di indeks berurutan dari kiri ke kanan. Index pada karakter pertama yaitu 0, dan index pada karakter terakhir dalam sebuah <em>String </em>di sebut <em>stringName </em>is <code>stringName.length - 1</code>.</p>
+
+<pre class="brush: js">'Blue Whale'.indexOf('Blue');     // mengembalikan  0
+'Blue Whale'.indexOf('Blute');    // mengembalikan -1
+'Blue Whale'.indexOf('Whale', 0); // mengembalikan  5
+'Blue Whale'.indexOf('Whale', 5); // mengembalikan  5
+'Blue Whale'.indexOf('', 9);      // mengembalikan  9
+'Blue Whale'.indexOf('', 10);     // mengembalikan 10
+'Blue Whale'.indexOf('', 11);     // mengembalikan 10
+</pre>
+
+<h3 id="Case-sensitivity">Case-sensitivity</h3>
+
+<p>The <code>indexOf()</code> method sangat <em>case sensitive</em>. Sebagai contoh, <em>expression</em> berikut ini mengembalikan -1:</p>
+
+<pre class="brush: js">'Blue Whale'.indexOf('blue'); // mengembalikan -1
+</pre>
+
+<h3 id="Checking_occurrences_Memeriksa_suatu_kejadian">Checking occurrences/ Memeriksa suatu kejadian</h3>
+
+<p>Catat bahwa  '0' tak bernilai <em>true</em> dan '-1' bukan bernilali <em>f<code>alse</code></em>. Oleh karena-nya, ketika memeriksa apakah sebuah <em>String</em>  Therefore, when checking if a specific string exists within another string the correct way to check would be:</p>
+
+<pre class="brush: js">'Blue Whale'.indexOf('Blue') !== -1; // true
+'Blue Whale'.indexOf('Bloe') !== -1; // false
+</pre>
+
+<h2 id="Examples">Examples</h2>
+
+<h3 id="Using_indexOf()_and_lastIndexOf()">Using <code>indexOf()</code> and <code>lastIndexOf()</code></h3>
+
+<p>The following example uses <code>indexOf()</code> and {{jsxref("String.prototype.lastIndexOf()", "lastIndexOf()")}} to locate values in the string <code>"Brave new world"</code>.</p>
+
+<pre class="brush: js">var anyString = 'Brave new world';
+
+console.log('The index of the first w from the beginning is ' + anyString.indexOf('w'));
+// logs 8
+console.log('The index of the last w from the beginning is ' + anyString.lastIndexOf('w'));
+// logs 10
+
+console.log('The index of "new" from the beginning is ' + anyString.indexOf('new'));
+// logs 6
+console.log('The index of "new" from the end is ' + anyString.lastIndexOf('new'));
+// logs 6
+</pre>
+
+<h3 id="indexOf()_and_case-sensitivity"><code>indexOf()</code> and case-sensitivity</h3>
+
+<p>The following example defines two string variables. The variables contain the same string except that the second string contains uppercase letters. The first {{domxref("console.log()")}} method displays 19. But because the <code>indexOf()</code> method is case sensitive, the string <code>"cheddar"</code> is not found in <code>myCapString</code>, so the second <code>console.log()</code> method displays -1.</p>
+
+<pre class="brush: js">var myString    = 'brie, pepper jack, cheddar';
+var myCapString = 'Brie, Pepper Jack, Cheddar';
+
+console.log('myString.indexOf("cheddar") is ' + myString.indexOf('cheddar'));
+// logs 19
+console.log('myCapString.indexOf("cheddar") is ' + myCapString.indexOf('cheddar'));
+// logs -1
+</pre>
+
+<h3 id="Using_indexOf()_to_count_occurrences_of_a_letter_in_a_string">Using <code>indexOf()</code> to count occurrences of a letter in a string</h3>
+
+<p>The following example sets <code>count</code> to the number of occurrences of the letter <code>e</code> in the string <code>str</code>:</p>
+
+<pre class="brush: js">var str = 'To be, or not to be, that is the question.';
+var count = 0;
+var pos = str.indexOf('e');
+
+while (pos !== -1) {
+  count++;
+  pos = str.indexOf('e', pos + 1);
+}
+
+console.log(count); // displays 4
+</pre>
+
+<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('ES1')}}</td>
+   <td>{{Spec2('ES1')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.5.4.7', 'String.prototype.indexOf')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-string.prototype.indexof', 'String.prototype.indexOf')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-string.prototype.indexof', 'String.prototype.indexOf')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("String.prototype.charAt()")}}</li>
+ <li>{{jsxref("String.prototype.lastIndexOf()")}}</li>
+ <li>{{jsxref("String.prototype.split()")}}</li>
+ <li>{{jsxref("Array.prototype.indexOf()")}}</li>
+</ul>