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

You would use Object.keys and Array.filter:

var result = {1: "PASS", 2: "PASS", 3: "FAIL", 4: "PASS", 5: "FAIL"};
var passCount = Object.keys(result).filter(function(key){
   return ( result[key] === 'PASS' );
}).length;