Create a `isPositive` function that takes a number as
Create a function named `isPositive` that takes a number as a argument, returning `true` if the number is strictly positive, and `false` otherwise.
parameter and return true if the given number is
stricly positive, or false otherwise
Create the `abs` function that takes one number argument
Create a function named `abs` that takes a number as an argument and returns its absolute value. You must make your own implementation. You **must not** use `Math.abs()`.
and returns its absolute value.
You are not allowed to use `Math.abs`, make your own.