JavaScript Number isInteger() method

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href="/jsref/jsref_isnan_number.html" title="JavaScript Number isNaN() Method">isNaN()</a></li> <li> Go Back to the Previous Level <a href="/jsref/jsref_obj_number.html" title="JavaScript Number Reference Manual">JavaScript Number Reference Manual</a></li> </ul> </div> <div> <h2>Definition and usage</h2> <p>If the value is an integer of the Number data type, then <code>Number.isInteger()</code> The method returns <code>true</code>. Otherwise return <code>false</code>.</p> </div> <div> <h2>Instance</h2> <h3>Example 1</h3> <p>Are these integers?</p> <pre class="language-js"> Number.isInteger(123); Number.isInteger(-123); Number.isInteger('123'); </pre> <p class="tiy"><a target="_blank" href="/tiy/t.html?f=jsck_isinteger_1">Try it yourself</a></p> <h3>Example 2</h3> <pre class="language-js"> Number.isInteger(4-2); Number.isInteger(4/2); Number.isInteger(5-2); Number.isInteger(5/2); </pre> <p class="tiy"><a target="_blank" href="/tiy/t.html?f=jsck_isinteger_2">Try it yourself</a></p> <h3>Example 3</h3> <p>Are these integers?</p> <pre class="language-js"> Number.isInteger(0); Number.isInteger(0/0); Number.isInteger(0.5); Number.isInteger(false); Number.isInteger(NaN); Number.isInteger(Infinity); Number.isInteger(-Infinity); </pre> <p class="tiy"><a target="_blank" href="/tiy/t.html?f=jsck_isinteger_3">Try it yourself</a></p> </div> <div> <h2>Syntax</h2> <pre>Number.isInteger(<i>value</i>)</pre> <h3>Parameter</h3> <table class="dataintable"> <tr> <th style="width: 25%;">Parameter</th> <th>Description</th> </tr> <tr> <td><i>value</i></td> <td>Required. The value to be tested.</td> </tr> </table> <h3>Return value</h3> <table class="dataintable"> <tr> <th style="width: 25%;">Type</th> <th>Description</th> </tr> <tr> <td>Boolean value</td> <td> <p>If the value is an integer of the Number data type, then <code>true</code>.</p> <p>otherwise return <code>false</code>.</p> </td> </tr> </table> </div> <div> <h2>Browser support</h2> <p><code>Number.isInteger()</code> is ECMAScript6 (ES6) feature.</p> <p>All modern browsers support ES6 (JavaScript 2015):</p> <table class="browser-support"> <tr> <th class="bsChrome">Chrome</th> <th class="bsEdge">Edge</th> <th class="bsFirefox">Firefox</th> <th class="bsSafari">Safari</th> <th class="bsOpera">Opera</th> </tr> <tr> <td>Chrome</td> <td>Edge</td> <td>Firefox</td> <td>Safari</td> <td>Opera</td> </tr> <tr> <td>Supported</td> <td>Supported</td> <td>Supported</td> <td>Supported</td> <td>Supported</td> </tr> </table> <p>Internet Explorer 11 (or earlier versions) does not support <code>Number.isInteger()</code>.</p> </div> <div class="prenextnav-ref"> <ul> <li> Previous Page <a href="/jsref/jsref_isfinite_number.html" title="JavaScript Number isFinite() Method">isFinite()</a></li> <li> Next Page <a href="/jsref/jsref_isnan_number.html" title="JavaScript Number isNaN() Method">isNaN()</a></li> <li> Go Back to the Previous Level <a href="/jsref/jsref_obj_number.html" title="JavaScript Number Reference Manual">JavaScript Number Reference Manual</a></li> </ul> </div><div style="background-color:#fcfdf8; padding:0;"> </div> </div>  <div id="sidebar"> <div><h3><center> Toolbox </center><h3> <h5 id="tools_reference"><a href="/jsref/index.html">JavaScript and HTML DOM Reference Manual</a></h5> <h5 id="tools_example"><a href="/js/js_examples.html">JavaScript Examples</a></h5> <h5 id="tools_quiz"><a href="/js/js_quiz.html">JavaScript Quiz</a></h5> <h5 id="tools_tutorial"><a href="/js/index.html">JavaScript Tutorial</a></h5> </div> <div><h3><center> Sponsor Links </center><h3> <div id="sbtg"> <script src="/myjs/zzsr.js"></script> </div> </div> </div> <div id="footer"> <p id="p1"> The content provided by CodeW3C.com is for training and testing purposes only and does not guarantee the accuracy of the content. 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