Sorting ascending and descending in Dart?

Question

I have this

var nlist = [4,2,1,5]; var compare = (a, b) => a.compareTo(b); nlist.sort(compare); print(nlist);        // [1,2,4,5] 

and here (where I changed the (b, a) to (a, b))

var nlist = [4,2,1,5] var compare = (b, a) => a.compareTo(b); nlist.sort(compare); print(nlist);        // [5,4,2,1] 

Why does this little modification change from ascending to descending order?

Answer 1

For ascending

var nlist = [1, 6, 8, 2, 16, 0] nlist.sort((a, b) => a.compareTo(b)); 

For descending

var nlist = [1, 6, 8, 2, 16, 0] nlist.sort((b, a) => a.compareTo(b));