JavaScript sort of Array of arrays

Question

I have this array of arrays. I want it to be sorted by arrays\' length. I use array.sort( (a, b) => a.length > b.length) );

[ 
  [],
  [ 2, 2,         


        

Answer 1

To do the sort function, you have to provide the max, min equal (+1 (>0 actually), -1 (<0 actually), 0 (for equals)), the faster way is by substract the results:

arr.sort(function(a, b){
  // ASC  -> a.length - b.length
  // DESC -> b.length - a.length
  return a.length - b.length ;
});