Each Character occurrence in a string

Question

How to write a javascript code that counts each character occurrence in a string ?

e.g 
String is : Hello World 

Output :  
count of H -> 1
count of e -&         


        

Answer 1

var counts = {};
yourstring.split('').map(function(ch) {
  counts[ch] = (counts[ch] || 0) + 1;
});

Or be hip and use map/reduce:

var counts = yourstring.split('').reduce(function(dst, c) {
  dst[c] = (dst[c] || 0) + 1;
  return dst;
}, {});