JS-Array-Filter.html

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    <h1>JS Array Filter</h1>
    <pre
      class="language-markup"
      tabindex="0"
    ><code class="language-markup"><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>JavaScript<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">&gt;</span></span><span class="token script"><span class="token language-javascript">
    <span class="token keyword">var</span> ages <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">12</span><span class="token punctuation">,</span> <span class="token number">19</span><span class="token punctuation">,</span> <span class="token number">20</span><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>ages <span class="token operator">+</span> <span class="token string">"&lt;br&gt;&lt;br&gt;"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">var</span> b <span class="token operator">=</span> ages<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>checkAdult<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 operator">+</span> <span class="token string">"&lt;br&gt;"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

	<span class="token keyword">function</span> <span class="token function">checkAdult</span><span class="token punctuation">(</span><span class="token parameter">age</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token keyword">return</span> age <span class="token operator">&gt;=</span> <span class="token number">18</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">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span></code></pre>
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  <script>
    let ary = [55, 64, 45, 46, 94, 64, 97, 31, 2, 5, 3];
    let func = ary.filter(checkadelt);
    document.write(func);
    function checkadelt(p1) {
      return p1 >= 18;
    }
  </script>
</html>