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Understanding Uninitialized Variables

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Abhisek Pattnaik
2015-12-24 06:44:37 +05:30
committed by SaintPeter
parent e23fc08181
commit 0b8044e608
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seed/challenges/01-front-end-development-certification/basic-javascript.json
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@ -171,7 +171,7 @@
"id": "56533eb9ac21ba0edf2244aa",
"title": "Understanding Uninitialized Variables",
"description": [
"When Javascript variables are declared, they have an inital value of <dfn>undefined</dfn>. If you do a mathematical operation on an <code>undefined</code> variable your result will be <dfn>NaN</dfn> which means \"Not a Number\". If you concatanate a string with an <code>undefined</code> variable, you will get a <dfn>literal string</dfn> of \"undefined\".",
"When Javascript variables are declared, they have an inital value of <code>undefined</code>. If you do a mathematical operation on an <code>undefined</code> variable your result will be <code>NaN</code> which means <dfn>\"Not a Number\"</dfn>. If you concatanate a string with an <code>undefined</code> variable, you will get a literal <dfn>string</dfn> of <code>\"undefined\"</code>.",
"<h4>Instructions</h4>",
"Initialize the three variables <code>a</code>, <code>b</code>, and <code>c</code> with <code>5</code>, <code>10</code>, and <code>\"I am a\"</code> respectively so that they will not be <code>undefined</code>."
],