Check if some element is false in an array in JavaScript

To check if some element is false in an array in JavaScript:

javascript
// First example, one element is false
let arr = [true, false, true, true];
let res = arr.some(elem => elem === false);

console.log(res);
// true

Second example:

javascript
// Second example, all elements are true
let arr = [true, true, true, true];
let res = arr.some(elem => elem === false);

console.log(res);
// false