Word Frequency Count, fix a bug with standard property

Question

I\'m trying to build a javascript function which would count the number of occurrences of each word in an input array.

Example :

Input

a=[\"a         


        

Answer 1

function count(arr){
  return arr.reduce(function(m,e){
    m[e] = (+m[e]||0)+1; return m
  },{});
}

The idea behind are

• the use of reduce for elegance
• the conversion of m[e] to a number using +m[e] to avoid the constructor (or toString) problem

Demonstration