javascript - Grouping js string array with counting

Question

I have simple array in js

var fruit = [ 'apple' , 'apple' , 'orange' ]

I need this groped so that i can present data in format:

apple 2
orange 1

I have tried with creating two arrays but all got out off control .

Answer 1

You can do this succinctly with with reduction:

function count(xs) {
  return xs.reduce(function(a,e) {
    return a[e] = ++a[e]||1, a;
  },{});
}

count(fruit); //=> {apple:2, orange:1}