JSFiddle - React, Tailwind, and code Playground

by Sajal Suraj

JavaScript

var a = [
  {
    "name" : "user1",
    "created": "may"
  },
  {
    "name" : "user2",
    "created": "may"
  },
  {
    "name" : "user3",
    "created": "may"
  },
  {
    "name" : "user4",
    "created": "may"
  },
  {
    "name" : "user5",
    "created": "june"
  },
  {
    "name" : "user6",
    "created": "june"
  },
  {
    "name" : "user7",
    "created": "august"
  },
  {
    "name" : "user8",
    "created": "august"
  },
  {
    "name" : "user9",
    "created": "august"
  },    

];

var counts = {};
for (var i = 0; i < a.length; i++) {
    var num = a[i];
    counts[num.created] = counts[num.created] ? counts[num.created]+1 : 1;
}
console.log(counts);