Sorting of an array in JavaScript [duplicate]

Question

arr=[-37.507,-3.263,40.079,27.999,65.213,-55.552];
arr.sort();

and the result is

arr=[-3.263,-37.507,-55.552,27.999,40.079,65.213]

Can any one help me what logic that "sort()" function is doing? Please explain me why "arr.sort();" gives the above result.? And other questions doesn't have the exact answer which explains what i am getting here.

Answer 1

array.sort sorts strings, if you want to sort numerically, you need a comparison-function:

array.sort(function(a, b){return a-b});

Answer 2

The default sort function treats each item as a string. Lexicographic order is not the same as numerical order. For numerical sorting, do this:

arr.sort(function (a, b) { return a - b });

The argument to sort() is a function that returns a negative number only if a comes before b.

Answer 3

use this:

arr.sort(function(a, b) {
    if (a>b) return 1;
    if (a<b) return -1;
    if (a==b) return 0;
});