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fix(curriculum): Improve Array Sort Challenge (#35756)

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* fix(curriculum): Improve Array Sort Challenge

* Update note to include in challenge description

Co-Authored-By: Manish-Giri <manish.giri.me@gmail.com>
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Manish Giri
2019-04-07 04:12:38 -04:00
committed by The Coding Aviator
parent e6a6bb0c82
commit c27dc72e4d
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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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@ -9,7 +9,11 @@ challengeType: 1
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>
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.
JavaScript's default sorting method is by string Unicode point value, which may return unexpected results. Therefore, it is encouraged to provide a callback function to specify how to sort the array items. When such a callback function, normally called <code>compareFunction</code>, is supplied, the array elements are sorted according to the return value of the <code>compareFunction</code>:
If <code>compareFunction(a,b)</code> returns a value less than 0 for two elements <code>a</code> and <code>b</code>, then <code>a</code> will come before <code>b</code>.
If <code>compareFunction(a,b)</code> returns a value greater than 0 for two elements <code>a</code> and <code>b</code>, then <code>b</code> will come before <code>a</code>.
If <code>compareFunction(a,b)</code> returns a value equal to 0 for two elements <code>a</code> and <code>b</code>, then <code>a</code> and <code>b</code> will remain unchanged.
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