Solution: Count characters
examples/arrays/count_characters.js
"use strict"; var string = "hello world"; var i, j; var counter = []; var chars = []; for (i = 0; i < string.length; i++) { // console.log(string[i]); var found = false; for (j = 0; j < chars.length; j++) { if (chars[j] == string[i]) { counter[j]++; found = true; break; } } if (! found) { chars.push(string[i]); counter.push(1); } } for (i = 0; i < chars.length; i++) { console.log(chars[i], counter[i]); }