Arrays are not identical after sorting even with identical values

Question

var a = [1,2,3]
var b = a.sort();

console.log(\'a\',a,\'b\',b); // a [1,2,3] b [1,2,3]
console.log(a === b); // true

a = [1,3,2];
console.log(a.sort() === b) // false
         


        

Answer 1

Dont know very well which numbers are you using, but I guess you must use the optional parameter compareFunction: (you can read complete guide here)

var arr = [ 40, 1, 5, 200 ];
function comparar ( a, b ){ return a - b; }
arr.sort( comparar );  // [ 1, 5, 40, 200 ]

Because if you dont use it you will get this: (numbers ordered by unicode)

var arr = [ 40, 1, 5, 200 ];
arr.sort();  //[ 1, 200, 40, 5 ] 

Answer 2

When comparing two arrays the return value is true if they are referring to the same object. The values or the content of the arrays are not compared.