Functions Exercise

Print out the following answers to the console:

• isEven():
  • Take a single numeric argument and return true if the number is even, or false otherwise.
  • isEven(4) -> true
  • isEven(21) -> false
  • isEven(68) -> true
  • isEven(333) -> true
• factorial():
  • Take a single numeric argument and return the factorial of that number.
  • factorial(5) -> 120
  • factorial(2) -> 2
  • factorial(10) -> 3628800
  • factorial(0) -> 1
• kebabToSnake():
  • Take a single kebab-cased string argument and return the snake_cased version.
  • kebabToSnake("hello-world") -> "hello_world"
  • kebabToSnake("dogs-are-awesome") -> "dogs_are_awesome"
  • kebabToSnake("blah") -> "blah"