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[Guide] Functional Programming: Sort an Array Alphabetically using the sort Method. Fixes and enhancements. (#34678)

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Nhat Khanh
2018-12-22 00:20:52 +07:00
committed by Aditya
parent 7feae93dc4
commit e5756ae1d6
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curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/sort-an-array-alphabetically-using-the-sort-method.english.md
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@ -8,7 +8,7 @@ challengeType: 1
<section id='description'>
The <code>sort</code> method sorts the elements of an array according to the callback function.
For example:
<blockquote>function ascendingOrder(arr) {<br>&nbsp;&nbsp;return arr.sort(function(a, b) {<br>&nbsp;&nbsp;&nbsp;&nbsp;return a - b;<br>&nbsp;&nbsp;});<br>}<br>ascendingOrder([1, 5, 2, 3, 4]);<br>// Returns [1, 2, 3, 4, 5]<br><br>function reverseAlpha(arr) {<br>&nbsp;&nbsp;return arr.sort(function(a, b) {<br>&nbsp;&nbsp;&nbsp;&nbsp;return a === b ? 0 : a < b ? : 1 : -1;<br>&nbsp;&nbsp;});<br>}<br>reverseAlpha(['l', 'h', 'z', 'b', 's']);<br>// Returns ['z', 's', 'l', 'h', 'b']</blockquote>
<blockquote>function ascendingOrder(arr) {<br>&nbsp;&nbsp;return arr.sort(function(a, b) {<br>&nbsp;&nbsp;&nbsp;&nbsp;return a - b;<br>&nbsp;&nbsp;});<br>}<br>ascendingOrder([1, 5, 2, 3, 4]);<br>// Returns [1, 2, 3, 4, 5]<br><br>function reverseAlpha(arr) {<br>&nbsp;&nbsp;return arr.sort(function(a, b) {<br>&nbsp;&nbsp;&nbsp;&nbsp;return a === b ? 0 : a < b ? 1 : -1;<br>&nbsp;&nbsp;});<br>}<br>reverseAlpha(['l', 'h', 'z', 'b', 's']);<br>// Returns ['z', 's', 'l', 'h', 'b']</blockquote>
Note: It's encouraged to provide a callback function to specify how to sort the array items. JavaScript's default sorting method is by string Unicode point value, which may return unexpected results.
</section>