排序JavaScript数组foreach

Question

I am new to programming. Can someone explain how is this function sorting integer array? It appears to be sorting an array. What is the purpose of creating array "d" here?

 function asc(f) { var d = []; f.map(function(e, i, a) { d[i] = e }) var k = []; f.forEach(function(e, i, a) { var g = d.indexOf(Math.min.apply(null, d)) var s = d.splice(g, 1) k[i] = s }) document.write(k) } asc([3, 4, 1, 2, -3, 20, 10, 22, 7, 5, 7, 8, 200, 6]) 

Answer 1

The array d is an exact copy of the original array. The code uses this copy because intentionally removes the minimum element on each itteration and stores it in the new k array which is the final sorted array. I have made comments in the code to show you what each line does.

 function asc(f) { //f is the original array var d = []; f.map(function(e, i, a) { d[i] = e })// create d as an exact copy of f var k = []; // the final sorted array f.forEach(function(e, i, a) { var g = d.indexOf(Math.min.apply(null, d)) // get the position of the minimum element of d var s = d.splice(g, 1) // remove the minimum element from d and store it in s k[i] = s // put s in the k array }) document.write(k) // write the sorted array in document } asc([3, 4, 1, 2, -3, 20, 10, 22, 7, 5, 7, 8, 200, 6]) 

Ofcourse there is a better way to sort an array using the builtin sort function.

 [3, 4, 1, 2, -3, 20, 10, 22, 7, 5, 7, 8, 200, 6].sort(function(a,b){ return ab })