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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 While Loop</title>
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<body>
<h1>JS While Loop</h1>
<p>
The while loop loops through a block of code as long as a specified
condition is true.
</p>
<h3>Syntax</h3>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript"><span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token parameter">condition</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token comment">// code block to be executed</span>
<span class="token punctuation">}</span></code></pre>
<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 comment">/*Increase While Loop Condition */</span>
<span class="token keyword">var</span> a <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span>a <span class="token operator"><=</span> <span class="token number">10</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>a <span class="token operator">+</span> <span class="token string">") Hello Yahoo Baba <br>"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
a <span class="token operator">=</span> a <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">/* Decrease While Loop Condition */</span>
<span class="token keyword">var</span> x <span class="token operator">=</span> <span class="token number">10</span><span class="token punctuation">;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span>x <span class="token operator">>=</span> <span class="token number">1</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>x <span class="token operator">+</span> <span class="token string">") Hello Yahoo Baba <br>"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
x <span class="token operator">=</span> x <span class="token operator">-</span> <span class="token number">1</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>
<button style="padding: 10px 20px" onclick="loop();">loop</button>
</body>
<script>
let a = 1000;
function loop() {
while (a >= 1) {
document.write("a is smaller than 1000 <br>");
a = a - 1;
}
}
</script>
</html>