Simple validation

validate.js

const validKeyNames = ['name', 'gender', 'hasTheForce']
var a = { name: 'Luke Skywalker', gender: 'Male', hasTheForce: true }
var b = { name: 'James Brown', gender: 'Male', hasTheFunk: true } 

function check(obj, arr) {
  return Object.keys(obj).every(e => arr.includes(e));
}

console.log(check(a, validKeyNames))
console.log(check(b, validKeyNames))

// originally posted at https://stackoverflow.com/questions/44240185/validate-javascript-object-keys-against-an-array