Get the item that appears the most times in an array

Question

var store = [\'1\',\'2\',\'2\',\'3\',\'4\'];

I want to find out that 2 appear the most in the array. How do I go about doing that?

Answer 1

Solution with emphasis to Array.prototype.forEach and the problem of getting more than one key if the max count is shared among more items.

Edit: Proposal with one loop, only.

var store = ['1', '2', '2', '3', '4', '5', '5'],
    distribution = {},
    max = 0,
    result = [];

store.forEach(function (a) {
    distribution[a] = (distribution[a] || 0) + 1;
    if (distribution[a] > max) {
        max = distribution[a];
        result = [a];
        return;
    }
    if (distribution[a] === max) {
        result.push(a);
    }
});
console.log('max: ' + max);
console.log('key/s with max count: ' + JSON.stringify(result));
console.log(distribution);