Array sort function

JavaScript
1

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

Please explain how this sorting function works in the back to sort numeric array.

2
1 Like
3

I went through this article and found that compare function swap the values as per the return values .If +1 then it places b before a and if its -1 then a before b and if 0 then no-change. But still not getting where the code is for swap. I am very new to coding so not getting it properly. I can’t see any code where we are changing the indexes of a and b or in other words swaping values.Please help me on this.

4

That’s just how the sort() method works, which is part of JS. It’s part of the langauge engine behind the scenes, written in C++ and pre-compiled so you won’t really see the code.

Just like you don’t see the code of how it stores a string in a variable in memory. You don’t need to worry about that because JS handles it.

It looks like there is pseudocode for how to implement JS sort here: https://tc39.es/ecma262/multipage/indexed-collections.html#sec-array.prototype.sort

But it sounds like you already get how it works, you just want to see the code?

2 Likes
5

Thank you so much for detailed explanation. It will help to understand future challenges as well !!!

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6

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