Functions Problem Set

isEven()

Write a function isEven() which takes a single numeric argument and returns true if the number is even, and false otherwise

isEven(4);    //true
isEven(21);   //false
isEven(68);   //true
isEven(333);  //false

factorial()

write a function factorial() which takes a single numeric argument and returns the factorial of that number

factorial(5);    //120
factorial(2);    //2
factorial(10);   //3628800
factorial(0);    //1

4! is 4 x 3 x 2 x 1

6! is 6 x 5 x 4 x 3 x 2 x 1

0! is 1

kebabToSnake()

write a function kebabToSnake()  which takes a single kebab-cased string argument and returns the snake_cased version.

kebabToSnake("hello-world");        //"hello_world"
kebabToSnake("dogs-are-awesome");   //"dogs_are_awesome"
kebabToSnake("blah");               //"blah"

Basically, replace "-"s with "_"s