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

<h2>question</h2>
<ol>
<li>]&nbsp;What is the &lsquo;Strict&rsquo; mode in JavaScript and how can it be enabled?</li>
</ol>
<h2>question-category</h2>
<ol>
<li>] SYNTAX</li>
</ol>
<h2>answer(source)</h2>
<ol>
<li>[] Strict Mode adds certain compulsions to JavaScript. Under the strict mode, JavaScript shows errors for a piece of codes, which did not show an error before, but might be problematic and potentially unsafe.</li>
<li>[] Strict mode also solves some mistakes that hamper the JavaScript engines to work efficiently.</li>
<li>[] Strict mode can be enabled by adding the string literal &ldquo;use strict&rdquo;&nbsp;above the file.</li>
</ol>
<h2>answer(me)</h2>
<ol>
<li><strong>[] to enable strict mode</strong></li>
<ol>
<li>] "use strict" must be placed as the first line in your script</li>
<li>] it can be set at the top of the script for global application or it can be set at the top of any function, to apply only in that function</li>
<li>] once it has been set,it can not be unset, it will&nbsp;</li>
</ol>
<li>[] strict mode enforces certain rules that normal mode does not, for ex all variables must be declared with the var keyword,</li>
<li>[] eliminates some silent js&nbsp;errors, causing them to throw an exception.&nbsp;</li>
<li>[] its intention is to prevent more errors in the program</li>
</ol>
<div>
<p><strong>[] what is "use strict", what does use strict do</strong></p>
<p>- https://javascript.info/strict-mode</p>
<p>- when es5 appeared in 2009 it added new functionality and modified some existing funcitonality</p>
<p>- the modified functionality is off by default</p>
<p>- you can enable this functionality by specifing 'use strict' at the top of your script</p>
<p>&nbsp;- can also be specified at the top of a given function to apply only to that function</p>
<p>- must be specified at the top of the script or function</p>
<p>- once it is enabled it cant be undone at some later point</p>
</div>
<h2>source</h2>
<ol>
<li><strong>[2015-06-30] <a href="/view/task?id=5211" target="_blank">RESEARCH google qry</a>= "javascript interview questions"</strong></li>
<ol>
<li>r# 5] <a href="http://career.guru99.com/top-85-javascript-interview-questions/" target="_blank">top 85 javascript interview questions</a> - @career.guru99.com - question 55</li>
</ol></ol>
<h2>reference</h2>
<ol>
<li><strong>[2015-05-30] NEW article IN tech-dev-www/language-js/index</strong></li>
<ol>
<li>x] # <a href="/view/article?id=4560" target="_blank">4560 - javascript interview - questions and answers</a> - A listing of 85 javascript interview questions by careerguru.com, with answers by Don Sagrott</li>
</ol>
<li><strong>[2015-08-10] NEW article</strong></li>
<ol>
<li>x] # <a href="/view/article?id=4616" target="_blank">4616 - LIST-javascript-interview-questions categories</a>&nbsp;-&nbsp;A listing of all of the different javascript interview question categories,</li>
</ol>
<li>strict mode</li>
<ol>
<li>] <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode">https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode</a>&nbsp;</li>
<li>] <a href="http://stackoverflow.com/questions/8651415/what-is-strict-mode-and-how-is-it-used">http://stackoverflow.com/questions/8651415/what-is-strict-mode-and-how-is-it-used</a>&nbsp;</li>
</ol></ol>

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