Question

I have an array containing a list of tags and count.

tags_array[0] = tags;
tags_array[1] = tags_count;

I need to sort the arrays base on the count so that I can pick out the top few tags.

Answer 1

Sort one, while storing the sort comparisons. Then sort the other using those results:

var res = [];
tags_count.sort( function( a, b ){ return res.push( a=a-b ), a; } );
tags.sort( function(){ return res.shift(); } );