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Functional Programming with ReasonML

Solution Review: The Factorial of a Number

This lesson explains the solution for the factorial of a number exercise.

We'll cover the following...

Solution

Reason
let rec fact = (n: int) => {
  /* Check if n is 0 or 1 */
  switch (n) {
    | 0 => 1; /* Base case */
    | n => n * fact(n - 1) /* Make recursive calls and multiply each time */
  };
};
Js.log(fact(5));

Explanation

This problem can be solved easily using ...