Sort 2D array in JavaScript

Question

I'm trying to sort the numbers in each array from greatest to smallest, but only the first one is being sorted. Do I need another nested loop? I'm stuck.

function sortNums(arr) {
  for(var i = 0; i < arr.length; i++){
     arr[i] = arr[i].sort(function(a, b){return b-a;});
     return arr; 
  }
}

sortNums([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]]);

Andreas Louv · Accepted Answer · 2016-05-28 11:44:02Z

1

When using the return keyword the function immediately terminated. Move it outside the iteration and you should be good:

function sortNums(arr) {
  for(var i = 0; i < arr.length; i++) {
     arr[i] = arr[i].sort(function(a, b) {
       return b - a;
     });
  }
  return arr;
}

sortNums([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]]);

answered May 28, 2016 at 11:44

Andreas Louv

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1 Comment

Andreas Louv Over a year ago

@Austin No problem, sometimes you just stare yourself blind on the problem :-)

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