Question

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sort not working with integers?
How to sort number in javascript sort method
Array.sort() doesn't sort numbers correctly

Code:

var x = [40,100,1,5,25,10];
x.sort();

output:

1,10,100,25,40,5

My expected output:

1,5,10,25,40,100

Answer 1

The JavaScript Array .sort() function by default converts the array elements to strings before making comparisons.

You can override that:

x.sort(function(e1, e2) { return e1 - e2; });

(The function passed should return a number that’s negative, zero, or positive, according to whether the first element is less than, equal to, or greater than the second.)

I’ve never seen a rationale for this odd aspect of the language.