Function with array and object

November 12, 2021

I have an array and an object and i would like a function samePrice(arr,obj) like this:

const arr = [0,1,2];
const obj = {
    0: 10,
    1: 10,
    2: 10,
    3: 12,
};

// samePrice(arr,obj) => true

const arr = [0,3];
const obj = {
    0: 10,
    1: 10,
    2: 10,
    3: 12,
};

// samePrice(arr,obj) => false

I have a solution with forEach but the function is 10+ lines long.. and I am sure there is a better solution.

>Solution :

Basically, what you’re doing is checking that every element is the same as the first:

const samePrice = (arr,obj) => arr.every(x => obj[x] == obj[arr[0]])

const arr = [0,1,2];
const obj = {
    0: 10,
    1: 10,
    2: 10,
    3: 12,
};

console.log(samePrice(arr,obj)); // => true

const arr2 = [0,3];
const obj2 = {
    0: 10,
    1: 10,
    2: 10,
    3: 12,
};

console.log(samePrice(arr2,obj2)); // => false