fix(iterators3): Enabled iterators3.rs to run without commented out tests.

This commit is contained in:
apogeeoak 2021-02-12 15:36:53 -05:00
parent ab57c26cf9
commit c6712dfccd
2 changed files with 34 additions and 25 deletions

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@ -1,11 +1,10 @@
// iterators3.rs // iterators3.rs
// This is a bigger exercise than most of the others! You can do it! // This is a bigger exercise than most of the others! You can do it!
// Here is your mission, should you choose to accept it: // Here is your mission, should you choose to accept it:
// 1. Complete the divide function to get the first four tests to pass // 1. Complete the divide function to get the first four tests to pass.
// 2. Uncomment the last two tests and get them to pass by filling in // 2. Get the remaining tests to pass by completing the result_with_list and
// values for `x` using `division_results`. // list_of_results functions.
// Execute `rustlings hint iterators3` to get some hints! // Execute `rustlings hint iterators3` to get some hints!
// Have fun :-)
// I AM NOT DONE // I AM NOT DONE
@ -21,16 +20,28 @@ pub struct NotDivisibleError {
divisor: i32, divisor: i32,
} }
// This function should calculate `a` divided by `b` if `a` is // Calculate `a` divided by `b` if `a` is evenly divisible by `b`.
// evenly divisible by b. // Otherwise, return a suitable error.
// 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> {}
// Complete the function and return a value of the correct type so the test passes.
// Desired output: Ok([1, 11, 1426, 3])
fn result_with_list() -> () {
let numbers = vec![27, 297, 38502, 81];
let division_results = numbers.into_iter().map(|n| divide(n, 27));
}
// Complete the function and return a value of the correct type so the test passes.
// Desired output: [Ok(1), Ok(11), Ok(1426), Ok(3)]
fn list_of_results() -> () {
let numbers = vec![27, 297, 38502, 81];
let division_results = numbers.into_iter().map(|n| divide(n, 27));
}
#[cfg(test)] #[cfg(test)]
mod tests { mod tests {
use super::*; use super::*;
// Tests that verify your `divide` function implementation
#[test] #[test]
fn test_success() { fn test_success() {
assert_eq!(divide(81, 9), Ok(9)); assert_eq!(divide(81, 9), Ok(9));
@ -57,22 +68,16 @@ mod tests {
assert_eq!(divide(0, 81), Ok(0)); assert_eq!(divide(0, 81), Ok(0));
} }
// Iterator exercises using your `divide` function
/*
#[test] #[test]
fn result_with_list() { fn test_result_with_list() {
let numbers = vec![27, 297, 38502, 81]; assert_eq!(format!("{:?}", result_with_list()), "Ok([1, 11, 1426, 3])");
let division_results = numbers.into_iter().map(|n| divide(n, 27));
let x //... Fill in here!
assert_eq!(format!("{:?}", x), "Ok([1, 11, 1426, 3])");
} }
#[test] #[test]
fn list_of_results() { fn test_list_of_results() {
let numbers = vec![27, 297, 38502, 81]; assert_eq!(
let division_results = numbers.into_iter().map(|n| divide(n, 27)); format!("{:?}", list_of_results()),
let x //... Fill in here! "[Ok(1), Ok(11), Ok(1426), Ok(3)]"
assert_eq!(format!("{:?}", x), "[Ok(1), Ok(11), Ok(1426), Ok(3)]"); );
} }
*/
} }

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@ -725,11 +725,15 @@ name = "iterators3"
path = "exercises/standard_library_types/iterators3.rs" path = "exercises/standard_library_types/iterators3.rs"
mode = "test" mode = "test"
hint = """ hint = """
Minor hint: In each of the two cases in the match in main, you can create x with either The divide function needs to return the correct error when even division is not
a 'turbofish' or by hinting the type of x to the compiler. You may try both. possible.
Major hint: Have a look at the Iter trait and at the explanation of its collect function. The division_results variable needs to be collected into a collection type.
Especially the part about Result is interesting."""
The result_with_list function needs to return a single Result where the success
case is a vector of integers and the failure case is a DivisionError.
The list_of_results function needs to return a vector of results."""
[[exercises]] [[exercises]]
name = "iterators4" name = "iterators4"