Count duplicates in an array [duplicate]

Answer 1

Try this:

var myArr = ['apple', 'apple', 'orange', 'apple', 'banana', 'orange', 'pineapple'];
var obj = {};
myArr.forEach(function(item) {
  if (typeof obj[item] == 'number') {
    obj[item]++;
  } else {
    obj[item] = 1;
  }
});
document.getElementById('output').innerHTML = Object.keys(obj).map(function(item) {
  return item + (obj[item] == 1 ? '' : ' ' + obj[item]);
}).join('\n');