Get total numbers of same key in array

count_keys_in_array.js

// E.g
// let array = ["sudhir", "hello", "test", "sudhir", "a", "a", "a"]
//output =  sudhir:2, hello:1, test: 1 and a:3
            
countKey(array){
		let obj = {}
		array.forEach(function(i){
			if(obj[i] == undefined){
				obj[i] = 0
			}
			obj[i] = obj[i] + 1
		})
		return obj
	}