Array.sort3kaya

Usage

Arguments

xs The array to sort

sortfn Optionally, a user-defined comparison function.

Overview

Sort an array in-place using the quicksort algorithm. By default this uses the Builtins.compare (3kaya) function and sorts in ascending order, but it can instead use a user supplied compare function.

xs = [3,5,1,2,6,1];
sort(xs); // [1,1,2,3,5,6]

Comparison functions should return 0 if the values are identical, less than zero if the first value passed to the function is 'smaller', and more than zero if the second value is 'bigger'. In this context, 'smaller' values are moved to the start of the array, and 'bigger' values to the end. The following example has a simple function to sort an array of Int s into descending order.

Int rsort(Int a, Int b) {
return b-a;
}

Void main() {
xs = [3,5,1,2,6,1];
sort(xs,rsort); // [6,5,3,2,1,1]
}

Values that are identical for the purposes of the sorting function will be placed in an undefined order relative to each other.

Related

The Array.sorted (3kaya) function returns a sorted copy of the array, rather than sorting in place.