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Simplify iterator method chaining exercise (#2427)

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The exercise is about iterators, _not_ generic integer types. The
`where` syntax has also not been introduced before, further adding
confusion for the students.
This commit is contained in:
Martin Geisler 2024-10-15 16:14:50 +02:00 committed by GitHub
parent 61407e6079
commit a387b2c755
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1 changed files with 1 additions and 12 deletions
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13
src/iterators/exercise.rs
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@ -20,10 +20,7 @@
/// wrapping around from the end of `values` to the beginning.
///
/// Element `n` of the result is `values[(n+offset)%len] - values[n]`.
fn offset_differences<N>(offset: usize, values: Vec<N>) -> Vec<N>
where
N: Copy + std::ops::Sub<Output = N>,
{
fn offset_differences(offset: usize, values: Vec<i32>) -> Vec<i32> {
// ANCHOR_END: offset_differences
let a = (&values).into_iter();
let b = (&values).into_iter().cycle().skip(offset);
@ -46,14 +43,6 @@ fn test_larger_offsets() {
assert_eq!(offset_differences(5, vec![1, 3, 5, 7]), vec![2, 2, 2, -6]);
}
#[test]
fn test_custom_type() {
assert_eq!(
offset_differences(1, vec![1.0, 11.0, 5.0, 0.0]),
vec![10.0, -6.0, -5.0, 1.0]
);
}
#[test]
fn test_degenerate_cases() {
assert_eq!(offset_differences(1, vec![0]), vec![0]);