Challenge 143 - Return First and Last Parameter

challenge_143.md

Challenge 143 - Return First and Last Parameter

Write two functions:

• first_arg() should return the first parameter passed in.
• last_arg() should return the last parameter passed in.

Examples

first_arg(1, 2, 3) ➞ 1

last_arg(1, 2, 3) ➞ 3

first_arg(8) ➞ 8

last_arg(8) ➞ 8

Notes

• Return None if the function takes no parameters.
• If the function only takes in one parameter, the first_arg and last_arg functions should return the same value.

challenge_tests.py

from typing import Any, Optional
import unittest


def first_arg() -> Optional[Any]:
    return  # Put your code here!!!


def last_arg() -> Optional[Any]:
    return  # Put your code here!!!


class Test(unittest.TestCase):
    def test_1(self):
        self.assertEqual(1, first_arg(1, 2, 3))

    def test_2(self):
        self.assertEqual('a', first_arg('a', 'b', 'c'))

    def test_3(self):
        self.assertEqual(8, first_arg(8))

    def test_4(self):
        self.assertEqual(None, first_arg())

    def test_5(self):
        self.assertEqual(3, last_arg(1, 2, 3))

    def test_6(self):
        self.assertEqual('c', last_arg('a', 'b', 'c'))

    def test_7(self):
        self.assertEqual(8, last_arg(8))

    def test_8(self):
        self.assertEqual(None, last_arg())


if __name__ == "__main__":
    unittest.main()

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