Validate javascript object keys against an array

Question

Given the following array

const validKeyNames = ['name', 'gender', 'hasTheForce']

Is it possible to check an objects key is one of an arrays elements .

I want to be able to do something like:

{ name: 'Luke Skywalker', gender: 'Male', hasTheForce: true } // => true
{ name: 'James Brown', gender: 'Male', hasTheFunk: true } // => false

Answer 1

You can use every() on Object.Keys() and check if key exists in array using includes()

 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)) 

Answer 2

I will give you an idea on how to achieve this.

1.Sort the array of valid keys initially using .sort() .

2.For each key in the object(using for in loop) check whether it is present in the array of valids until key <= array[iterator] . Whenever key > array[iterator] you can safely confirm that key is not present in the array.

Answer 3

You could use Object.hasOwnProperty and bind the object for checking.

 function check(object) { return validKeyNames.every({}.hasOwnProperty.bind(object)); } const validKeyNames = ['name', 'gender', 'hasTheForce'] console.log(check({ name: 'Luke Skywalker', gender: 'Male', hasTheForce: true })); // true console.log(check({ name: 'James Brown', gender: 'Male', hasTheFunk: true })); // false 

Answer 4

I think you can validate using something like this:

    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).sort().toString() === arr.sort().toString()
}

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