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<h2>question</h2>
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<li><span style="font-size: medium;">[] </span><span style="display: inline !important; float: none; background-color: #ffffff; color: #000000; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: medium; font-style: normal; font-variant: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px;">what are promises?</span></li>
<li><span style="display: inline !important; float: none; background-color: #ffffff; color: #000000; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: medium; font-style: normal; font-variant: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px;">[] why do we use them?<br /></span></li>
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<h2>question-category</h2>
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<li>[] ?= es6</li>
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<h2>answer(source)</h2>
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<li>[]&nbsp;</li>
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<h2>answer(me)</h2>
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<li><span style="font-size: medium;">[what] Promises are a new mechanism introduced in native js in the es6 spec and are used to ?facilitate? asynchronous programming in javascript. A promise is a placeholder value, that enables code execution to continue without affecting the outcome of future results that depend on the promises value</span></li>
<li><span style="font-size: medium;">[why] Promises are used to control the order of code execution. An example case would be where function 2 that requires the results/output of function 1,&nbsp; if function 1 is a long running function (like a database query), function 2 may begin its execution before function 1 returns and will then fail.&nbsp;<br /></span></li>
<li>[+=] prev Promise functionaly have been used/implemented in javascript using libraries like jquery&nbsp;</li>
<li>[+=]&nbsp;<span style="font-size: medium;"><br /></span></li>
<li><strong>[+=] COMPARE &amp; CONTRAST</strong></li>
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<li>[] callbacks are another mechanism that you can use to control the sequential flow of execution,&nbsp;</li>
<li>[] the problem is with multiple sequential steps, callbacks can be nested several layers deep and it gets confusing and messy to manage.</li>
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<li><strong>[+=] ADVANTAGE/BENEFIT/PRO of Promises VS&nbsp;</strong></li>
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<li>[] much cleaner management of code flow</li>
<li>[] getData().then(sortData).then(filterData).done(fileData)</li>
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<h2>source</h2>
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<li><strong>[] # 5767 -&nbsp; </strong><strong><a href="/view/article?id=5767" target="_blank">javascript-interview-questions-top-10</a> </strong>[] youtuber tech sith, gives his thoughts on what some of the top (most commonly asked) javascript interview questions are? He also gives and explains his answers to each of the questions.</li>
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<h2>reference</h2>
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<li>[x] # # - article IN BOOK-<a href="/view/chapters?id=191" target="_blank">language-javascript</a>-CHAPTER-00n-___&nbsp;</li>
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