Check if an array contains something other than null in javascript?

Question

I have an array that will most likely always look like:

[null, null, null, null, null]

sometimes this array might change to something like:

["helloworld", null, null, null, null]

I know I could use a for loop for this but is there a way to use indexOf to check if something in an array that is not equal to null.

I am looking for something like:

var index = indexof(!null);

Answer 1

Use some which returns a boolean:

const arr = [null, 2, null, null];
const arr2 = [null, null, null, null];

function otherThanNull(arr) {
  return arr.some(el => el !== null);
}

console.log(otherThanNull(arr));
console.log(otherThanNull(arr2));