JSFiddle - React, Tailwind, and code Playground

by vjeux

JavaScript

var before = {1: true, 2: true}
var after = {2: true, 3: false}

for (var key in before) {
    if (!(key in after)) {
        console.log(key, ' removed');
    }
}

for (var key in after) {
    if (!(key in before)) {
        console.log(key, ' added');
    }
}