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JS-Map-Method.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>JS Map Method</title>
<style>
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<body>
<hr />
<p>
<code>map()</code> creates a new array from calling a function for
every array element.
</p>
<p>
<code>map()</code> does not execute the function for empty elements.
</p>
<p><code>map()</code> does not change the original array.</p>
<h3>Syntax</h3>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript"><span class="token keyword">class</span> <span class="token operator">=</span> <span class="token string">"table table-striped table-bordered"</span>
</code></pre>
<h3>Parameters</h3>
<table class="table table-bordered table-striped">
<tbody>
<tr></tr>
<tr>
<td>Parameter</td>
<td>Description</td>
</tr>
<tr>
<td><em>function()</em></td>
<td>
Required.<br />
A function to be run for each array element.
</td>
</tr>
<tr>
<td><em>currentValue</em></td>
<td>
Required.<br />
The value of the current element.
</td>
</tr>
<tr>
<td><em>index</em></td>
<td>
Optional.<br />
The index of the current element.
</td>
</tr>
<tr>
<td><em>arr</em></td>
<td>
Optional.<br />
The array of the current element.
</td>
</tr>
<tr>
<td><em>thisValue</em></td>
<td>
Optional.<br />
Default value <code>undefined</code>.<br />
A value passed to the function to be used as
its <code>this</code> value.
</td>
</tr>
</tbody>
</table>
<hr />
<h3>Return Value</h3>
<table class="table table-bordered table-striped">
<tbody>
<tr></tr>
<tr>
<td>Type</td>
<td>Description</td>
</tr>
<tr>
<td>An array</td>
<td>The results of a function for each array element.</td>
</tr>
</tbody>
</table>
<hr />
<pre
class="language-markup"
tabindex="0"
><code class="language-markup"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>JavaScript<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span><span class="token punctuation">></span></span><span class="token script"><span class="token language-javascript">
<span class="token keyword">var</span> ary <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">11</span><span class="token punctuation">,</span><span class="token number">4</span><span class="token punctuation">,</span><span class="token number">9</span><span class="token punctuation">,</span><span class="token number">16</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> b <span class="token operator">=</span> ary<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span>test<span class="token punctuation">)</span><span class="token punctuation">;</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>b<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">function</span> <span class="token function">test</span><span class="token punctuation">(</span><span class="token parameter">x</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token keyword">return</span> x <span class="token operator">*</span> <span class="token number">10</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span></code></pre>
<hr />
<pre
class="language-markup"
tabindex="0"
><code class="language-markup"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>JavaScript<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span><span class="token punctuation">></span></span><span class="token script"><span class="token language-javascript">
<span class="token keyword">var</span> ary <span class="token operator">=</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span><span class="token literal-property property">fname</span> <span class="token operator">:</span> <span class="token string">"Yahoo"</span> <span class="token punctuation">,</span> <span class="token literal-property property">lname</span> <span class="token operator">:</span> <span class="token string">"Baba"</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
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document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>b<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">function</span> <span class="token function">test</span><span class="token punctuation">(</span><span class="token parameter">x</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token keyword">return</span> x<span class="token punctuation">.</span>fname <span class="token operator">+</span> <span class="token string">" "</span> <span class="token operator">+</span> x<span class="token punctuation">.</span>lname<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span></code></pre>
<hr />
</body>
<script>
"use strict";
let ary = [10, 20, 30, 40, 50, 60];
let b = ary.map(test);
document.write(b);
function test(y) {
return y * 10;
}
</script>
</html>