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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 Switch Case</title>
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<body>
<h1>JavaScript Switch Statement</h1>
<p>
The JavaScript switch statement is used to execute one code from multiple
expressions. It is just like else if statement that we have learned in
previous page. But it is convenient than if..else..if because it can be
used with numbers, characters etc.
</p>
<p>The signature of JavaScript switch statement is given below.</p>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript"><span class="token keyword">switch</span><span class="token punctuation">(</span>expression<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">case</span> x<span class="token operator">:</span>
<span class="token comment">// code block</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> y<span class="token operator">:</span>
<span class="token comment">// code block</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">default</span><span class="token operator">:</span>
<span class="token comment">// code block</span>
<span class="token punctuation">}</span>
</code></pre>
<p>This is how it works:</p>
<ol>
<li>This is how it works:</li>
<li>
The value of the expression is compared with the values of each case.
</li>
<li>If there is a match, the associated block of code is executed.</li>
<li>If there is no match, the default code block is executed.</li>
</ol>
<h1>The break Keyword</h1>
<p>
When JavaScript reaches a break keyword, it breaks out of the switch
block.
</p>
<p>This will stop the execution inside the switch block.</p>
<p>
It is not necessary to break the last case in a switch block. The block
breaks (ends) there anyway.
</p>
<p>
Note: If you omit the break statement, the next case will be executed even
if the evaluation does not match the case.
</p>
<hr />
<h1>The default Keyword</h1>
<p>
The default keyword specifies the code to run if there is no case match:
</p>
<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> day <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span>
<span class="token keyword">switch</span> <span class="token punctuation">(</span>day<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">case</span> <span class="token number">0</span><span class="token operator">:</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"Today is Monday"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> <span class="token number">1</span><span class="token operator">:</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"Today is Tuesday"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> <span class="token number">2</span><span class="token operator">:</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"Today is Wednesday"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> <span class="token number">3</span><span class="token operator">:</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"Today is Thursday"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> <span class="token number">4</span><span class="token operator">:</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"Today is Friday"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> <span class="token number">5</span><span class="token operator">:</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"Today is Saturday"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> <span class="token number">6</span><span class="token operator">:</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"Today is Sunday"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">default</span><span class="token operator">:</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"Enter the valid Week Day"</span><span class="token punctuation">)</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>
</body>
<script>
let day = 1;
switch (day) {
case 0:
document.write("Today is Monday");
break;
case 1:
document.write("Today is Tuesday");
break;
case 2:
document.write("Today is Wednesday");
break;
case 3:
document.write("Today is Thursday");
break;
case 4:
document.write("Today is Friday");
break;
case 5:
document.write("Today is Saturday");
break;
case 6:
document.write("Today is Sunday");
break;
default:
document.write("Enter the valid Week day");
}
</script>
</html>