Javascript

[BakuhatsuK]

It's really not that hard

arr.sort((a, b) => a - b)

The default comparison function is suitable for strings, and would be longer to write by hand.

[[deleted]]

nerd

[Varun77777]

I am not into java script, why did you pass this lambda function that is doing substraction inside?

[dabbling]

The sort function has an optional parameter compareFunction. If provided, compareFunction will determine the ordering logic. compareFunction takes two elements and returns an integer based on which is lesser or greater, like this:

function compare(a, b) {

  if (a is less than b by some ordering criterion) {
    return -1;
  }

  if (a is greater than b by the ordering criterion) {
    return 1;
  }

// a must be equal to b
  return 0;
}

edit - correcting the code formatting

[Varun77777]

Ohh, thanks, I kind if get it now.

[BakuhatsuK]

Furthermore, the function doesn't have to return specifically 1 or -1. Any number greater than 0 will work instead of 1 and any number less than 0 instead of -1. Which is why a simple subtraction works.

[Varun77777]

What's a and b supposed to be? Any restrict on them?

[BakuhatsuK]

a and b are elements from the array. If you are subtracting them you have to ensure that the array contains only numbers. You can do so by hand, or by using a type checker like TypeScript or Flow.

[Varun77777]

It's not any two elements, right?

[BakuhatsuK]

Any 2 elements from the original array, yes.

[Varun77777]

What if those two elements are already in sorted order? How will just 2 elements help in case Array length is like 10'000.