JavaScript Primitive Data Types

JavaScript Primitive Data Types

<span class="pln">
</span><span class="com">// Primitive Data Types</span><span class="pln">
</span><span class="kwd">let</span><span class="pln"> numberVar </span><span class="pun">=</span><span class="pln"> </span><span class="lit">42</span><span class="pun">;</span><span class="pln">              </span><span class="com">// Number</span><span class="pln">
console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="pln">numberVar</span><span class="pun">);</span><span class="pln"> 

</span><span class="kwd">let</span><span class="pln"> stringVar </span><span class="pun">=</span><span class="pln"> </span><span class="str">"hello"</span><span class="pun">;</span><span class="pln">         </span><span class="com">// String</span><span class="pln">
console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="pln">stringVar</span><span class="pun">);</span><span class="pln"> 

</span><span class="kwd">let</span><span class="pln"> booleanVar </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">true</span><span class="pun">;</span><span class="pln">           </span><span class="com">// Boolean</span><span class="pln">
console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="pln">booleanVar</span><span class="pun">);</span><span class="pln"> 

</span><span class="kwd">let</span><span class="pln"> undefinedVar</span><span class="pun">;</span><span class="pln">                </span><span class="com">// Undefined</span><span class="pln">
console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="pln">undefinedVar</span><span class="pun">);</span><span class="pln"> 

</span><span class="kwd">let</span><span class="pln"> nullVar </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">null</span><span class="pun">;</span><span class="pln">               </span><span class="com">// Null</span><span class="pln">
console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="pln">nullVar</span><span class="pun">);</span><span class="pln"> 

</span><span class="com">// Printing the types</span><span class="pln">
console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="kwd">typeof</span><span class="pln"> numberVar</span><span class="pun">);</span><span class="pln">    </span><span class="com">// Output: number</span><span class="pln">
console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="kwd">typeof</span><span class="pln"> stringVar</span><span class="pun">);</span><span class="pln">    </span><span class="com">// Output: string</span><span class="pln">
console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="kwd">typeof</span><span class="pln"> booleanVar</span><span class="pun">);</span><span class="pln">   </span><span class="com">// Output: boolean</span><span class="pln">
console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="kwd">typeof</span><span class="pln"> undefinedVar</span><span class="pun">);</span><span class="pln"> </span><span class="com">// Output: undefined</span><span class="pln">
console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="kwd">typeof</span><span class="pln"> nullVar</span><span class="pun">);</span><span class="pln">      </span><span class="com">// Output: object (typeof null is a historical quirk)</span>