javascript - How do I check if all elements of an array are null?

Question

What's the best way to check for an array with all null values besides using Lodash, possibly with ES6?

var emp = [null, null, null];
if (_.compact(emp).length == 0) {
  ...
}

Answer 1

A side note: Your solution doesn't actually check for an all-null array. It just checks for an all-falsey array. [0, false, ''] would still pass the check.

You could use the Array#every method to check that every element of an array meets a certain condition:

const arr = [null, null, null];
console.log(arr.every(element => element === null));