JSFiddle - React, Tailwind, and code Playground

by hbjpn

JavaScript

var a = {a:2, b:4, d:5, r:7, s:6, f:3};
var b = {a:2, b:4, d:5, r:7};

function subtractArray(A, B)
{
    return A.filter(function(i) {return B.indexOf(i) < 0;});
}

console.log(subtractArray(Object.keys(a), Object.keys(b)));