I have a question regarding javascript's sort() function
var arr = [23,43,54,2,3,12];
arr.sort();
it's output is [12, 2, 23, 3, 43, 54]
well it should be [2, 3, 12, 23, 43, 54]?
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stackoverflow.com/questions/1063007/…aahhaa– aahhaa2017-09-11 18:02:51 +00:00Commented Sep 11, 2017 at 18:02
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2Possible duplicate of How to sort an array of integers correctlyBrian– Brian2017-09-11 18:02:52 +00:00Commented Sep 11, 2017 at 18:02
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1it's taking the first digit when sorting as your values represent stringspokeybit– pokeybit2017-09-11 18:02:57 +00:00Commented Sep 11, 2017 at 18:02
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3 Answers
It's because you're sorting the numbers with the default sorting algorithm, which converts them to a string and sorts lexicographically.
Instead pass a function defining a sort order via its return value.
var arr = [23,43,54,2,3,12];
console.log(arr.sort((a, b) => a - b));Returning a positive number moves a toward the end of the list.
Comments
You have to specify a sort function
[12, 2, 23, 3, 43, 54].sort(function (a, b) { return a - b ; } )
The javascript specification states that sort should perform lexicografic sorting, docs
answered Sep 11, 2017 at 18:02
Titian Cernicova-Dragomir
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2 Comments
spanky
You shouldn't return a boolean. The sorter expects a numeric return value. Returning a boolean may give incorrect results in some cases.
Titian Cernicova-Dragomir
@spanky you are right, changed to address this feedback,
The sorting of number is based on Unicode. Hence the oder you have is correct. Refer the link for details.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort
