💵Prefill an Array

Create the function prefill that returns an array of n elements that all have the same value v. See if you can do this without using a loop.

You have to validate input:

• v can be anything (primitive or otherwise)
• if v is ommited, fill the array with undefined
• if n is 0, return an empty array
• if n is anything other than an integer or integer-formatted string (e.g. '123') that is >=0, throw a TypeError

When throwing a TypeError, the message should be n is invalid, where you replace n for the actual value passed to the function.

Code Examples

    prefill(3,1) --> [1,1,1]

    prefill(2,"abc") --> ['abc','abc']

    prefill("1", 1) --> [1]

    prefill(3, prefill(2,'2d'))
      --> [['2d','2d'],['2d','2d'],['2d','2d']]

    prefill("xyz", 1)
      --> throws TypeError with message "xyz is invalid"

Best Practices

Py First:

def prefill(n=0,v=None):
    try:
        return [v] * int(n)
    except:
        raise TypeError(str(n) + ' is invalid')

Py Second:

def prefill(n, v = None):
  try:
    return int(n)*[v]
  except:
    raise TypeError(str(n) + " is invalid")

Py Third:

def prefill(n,v = 'undefined'):
    try:
        return [v] * int(n)
    except:
        raise TypeError('{} is invalid'.format(n))