(public).sospep.systems ~ view step ~ question-general

<h2>question</h2>
<ol>
<li>] <span style="font-size: medium;">what is the difference between null and undefined</span></li>
</ol>
<h2>question-category</h2>
<ol>
<li>[] GENERAL&nbsp;</li>
</ol>
<h2>answer(source)</h2>
<ol>
<li>[] they both represent empty values.&nbsp;</li>
<ol>
<li>[] when you define a var but not assign a value, it automatically puts a placeholder called undefined, you dont have to do it, javascript does it</li>
<li>[] with null you are doing it yourself (explicitly setting an object to no value)</li>
</ol>
<li>[] doing a typeof (undefined) returns undefined</li>
<ol>
<li>[] doing a typeof(null) returns {object}</li>
</ol></ol>
<h2>answer(me)</h2>
<ol>
<li>[] <strong>null </strong>is a <strong>value;</strong>&nbsp;</li>
<ol>
<li>[] null is typically used to represent nothing or that the 'operand' has no value</li>
</ol>
<li>[]<strong> undefined</strong> is a type</li>
<ol>
<li>[] when a variable is declared but has not yet been assigned a value, it will have a value of undefined</li>
<li>[] when a variable is not declared but is attempted to use, it well generate an error of "is not defined"</li>
</ol></ol>
<h2>source</h2>
<ol>
<li><strong>[] # 5767 -&nbsp; </strong><strong><a href="/view/article?id=5767" target="_blank">javascript-interview-questions-top-10</a> </strong>[] youtuber tech smith, gives his thoughts on what some of the top (most commonly asked) javascript interview questions are? He explains answers to each of his questions.</li>
</ol>
<h2>reference</h2>
<ol>
<li>[] # 374 - <a href="/view/step?id=374" target="_blank">What do you mean by NULL in Javascript?</a><strong></strong><em></em></li>
</ol>

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