Simplest way to get count of keys with a particular value

Question

Given a javascript object, what is the simplest way to get the number of keys with a particular value?

For example, I have the following javascript obje

Answer 1

Just filter and get the length.

var result = { 1: "PASS", 2: "PASS", 3: "FAIL", 4: "PASS", 5: "FAIL" };

function getCount(s, o) {
    return Object.keys(result).filter(function (k) { return o[k] === s; }).length;
}

document.write(getCount('PASS', result));