sort function explained javascript

1var points = [40, 100, 1, 5, 25, 10];
2points.sort((a,b) => a-b)
3
4

1//sorts arrays of numbers
2function myFunction() {
3  points.sort(function(a, b){return a-b});
4  document.getElementById("demo").innerHTML = points;
5}

1var sortedArray = myArray.sort(function(a,b){
2                                   if (a.name < b.name)
3                                      return -1;
4                                   else if (a.name == b.name)
5                                      return 0;
6                                   else
7                                      return 1;
8                               });