Triggers error if index is negative number, saying "value not found in array".
This function is intended to be called after you've called Array.indexOf(), or any
function that returns a negative number if the value being searched for in the array
was not found. You then pass that resulting index to this function.
let arr = [1,2,3,4];
let index = arr.indexOf(5);
errorIfIndexIsNegative(index);
// "Error: value not found in array"
npm install error-if-index-is-negative
import { errorIfIndexIsNegative } from 'error-if-index-is-negative';