From e63c87114750f9b92a2bed24a4c4deaf1cd8ac92 Mon Sep 17 00:00:00 2001
From: lukaszKielar <kielar.lukasz@hotmail.com>
Date: Tue, 30 Jun 2020 19:56:31 +0200
Subject: [PATCH] finish iterators3
---
.../standard_library_types/iterators3.rs | 27 ++++++++++++++-----
1 file changed, 20 insertions(+), 7 deletions(-)
diff --git a/exercises/standard_library_types/iterators3.rs b/exercises/standard_library_types/iterators3.rs
index 353cea6..9de952f 100644
--- a/exercises/standard_library_types/iterators3.rs
+++ b/exercises/standard_library_types/iterators3.rs
@@ -7,8 +7,6 @@
// Execute `rustlings hint iterators3` to get some hints!
// Have fun :-)
-// I AM NOT DONE
-
#[derive(Debug, PartialEq, Eq)]
pub enum DivisionError {
NotDivisible(NotDivisibleError),
@@ -24,7 +22,18 @@ pub struct NotDivisibleError {
// This function should calculate `a` divided by `b` if `a` is
// evenly divisible by b.
// Otherwise, it should return a suitable error.
-pub fn divide(a: i32, b: i32) -> Result<i32, DivisionError> {}
+pub fn divide(a: i32, b: i32) -> Result<i32, DivisionError> {
+ if b == 0 {
+ Err(DivisionError::DivideByZero)
+ } else if (a % b) != 0 {
+ Err(DivisionError::NotDivisible(NotDivisibleError {
+ dividend: a,
+ divisor: b,
+ }))
+ } else {
+ Ok(a / b)
+ }
+}
#[cfg(test)]
mod tests {
@@ -58,12 +67,14 @@ mod tests {
}
// Iterator exercises using your `divide` function
- /*
#[test]
fn result_with_list() {
let numbers = vec![27, 297, 38502, 81];
let division_results = numbers.into_iter().map(|n| divide(n, 27));
- let x //... Fill in here!
+ // we need to collect Result object, where:
+ // - Ok -> Vec<i32>
+ // - Err -> DivisionError
+ let x = division_results.collect::<Result<Vec<_>, DivisionError>>();
assert_eq!(format!("{:?}", x), "Ok([1, 11, 1426, 3])");
}
@@ -71,8 +82,10 @@ mod tests {
fn list_of_results() {
let numbers = vec![27, 297, 38502, 81];
let division_results = numbers.into_iter().map(|n| divide(n, 27));
- let x //... Fill in here!
+ // we need to collect vector of results, where:
+ // - Ok -> i32
+ // - Err -> DivisionError
+ let x = division_results.collect::<Vec<Result<i32, DivisionError>>>();
assert_eq!(format!("{:?}", x), "[Ok(1), Ok(11), Ok(1426), Ok(3)]");
}
- */
}