Merge pull request #56 from mwilli20/patch-1

Create iterators4.rs
This commit is contained in:
Carol (Nichols || Goulding) 2017-03-19 10:02:51 -04:00 committed by GitHub
commit 2ee6e22e5c
1 changed files with 59 additions and 0 deletions

View File

@ -0,0 +1,59 @@
pub fn factorial(num: u64) -> u64 {
// Complete this function to return factorial of num
// Do not use:
// - return
// For extra fun don't use:
// - imperative style loops (for, while)
// - additional variables
// For the most fun don't use:
// - recursion
// Scroll down for hints.
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn factorial_of_1() {
assert_eq!(1, factorial(1));
}
#[test]
fn factorial_of_2() {
assert_eq!(2, factorial(2));
}
#[test]
fn factorial_of_4() {
assert_eq!(24, factorial(4));
}
}
// In an imperative language you might write a for loop to iterate through
// multiply the values into a mutable variable. Or you might write code more
// functionally with recursion and a match clause. But you can also use ranges
// and iterators to solve this in rust.