element occurrence in array

by Akram kamal

JavaScript

var data = ["a","b","c","d","e","a","b","b","b","c","d","d","e","a"];

var topic={}
$.each(data,function(i,letter){
	if (!topic[letter]) topic[letter]=0
    topic[letter]++
})

console.log(topic) // raw

console.log(JSON.stringify(topic)) //pretty