Prefill an Array

Prefill an ArrayCodewars

Approach

solve the problem

1. check invalid input

   1. if boolean type return 'TypeError'

   2. if is not integer return 'TypeError'

   3. if is less than 0 return 'TypeError'

2. repeat *n times 'a' character and split as an array (it's for iteration)

3. iterate and return *v

Solution

JavaScript

const prefill = (n, v) => {
  if (typeof n === 'boolean' || !Number.isInteger(Number(n)) || Number(n) < 0) {
    throw new TypeError(`${n} is invalid`);
  }
  
  return [...'a'.repeat(Number(n))].map(() => v);
};