Remove empty elements from an array in Javascript

Question

How do I remove empty elements from an array in JavaScript?

Is there a straightforward way, or do I need to loop through it and remove them manually?

Answer 1

For removing holes, you should use

arr.filter(() => true)
arr.flat(0) // Currently stage 3, check compatibility before using this

For removing hole, and, falsy (null, undefined, 0, -0, NaN, "", false, document.all) values:

arr.filter(x => x)

For removing hole, null, and, undefined:

arr.filter(x => x != null)

arr = [, null, (void 0), 0, -0, NaN, false, '', 42];
console.log(arr.filter(() => true)); // [null, (void 0), 0, -0, NaN, false, '', 42]
console.log(arr.filter(x => x)); // [42]
console.log(arr.filter(x => x != null)); // [0, -0, NaN, false, "", 42]