Count number of elements with certain properties inside JSON

Question

I have some JSON data:

{\"humans\": [
    { \"firstName\" : \"Paul\", \"lastName\" : \"Taylor\", \"hairs\": 2 },
    { \"firstName\" : \"Sharon\", \"lastName         


        

Answer 1

javascript for loop is fastest:

var counter = 0;

for (var i = 0; i < data.humans.length; i++) {
   if (data.humans[i].hairs === 2) {
      counter++;
   }
}