How to rotate a matrix in an array in javascript

Question

(disclosure, I\'m mostly math illiterate).

I have an array in this format:

var grid = [
  [0,0], [0,1], [0,2], [0,3],
  [1,0], [1,1], [1,2], [1,3],
          


        

Answer 1

These are two function for clockwise and counterclockwise 90-degree rotation:

    function rotateCounterClockwise(a){
        var n=a.length;
        for (var i=0; i