Typescript .sort() skips over a value

Given the array of numbers

let el = [25000,48000,57000,86000,33000,10000,42000,3000,54000,29000,79000,40000];

The output of the following suggests that it ignores the value of 3000

let el = [25000,48000,57000,86000,33000,10000,42000,3000,54000,29000,79000,40000];
console.log(el.sort());

//Output [10000, 25000, 29000,3000, 33000, 40000,42000, 48000, 54000,57000, 79000, 86000]

So it did sort, but didn’t move the 3000 at the 4th position. Why is this happening?

>Solution :

As VLAZ explained, By default, the sort() function sorts values as strings. if numbers are sorted as strings, "25" is bigger than "100", because "2" is bigger than "1".

Because of this, the sort() method will produce incorrect results when sorting numbers.

You can fix this by providing a compare function: (a, b) => a - b)

let el = [25000,48000,57000,86000,33000,10000,42000,3000,54000,29000,79000,40000];
console.log(el.sort((a, b) => a - b));

checkout: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort