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Good deprecation practice with clear migration path
Category
Maintainability Code Snippet
#deprecated("use _.rev().fold(...) instead")
pub fn[A, B] T::rev_fold(self : T[A], init~ : B, f : (B, A) -> B) -> B Recommendation
The current approach is correct. Keep as is. Reasoning
The deprecation notice clearly indicates the alternative approach, making it easy for users to migrate their code. This follows good API evolution practices.
Consider optimizing rev_foldi implementation
Category
Performance Code Snippet
pub fn[A, B] T::rev_foldi(self : T[A], init~ : B, f : (Int, B, A) -> B) -> B {
self.rev().foldi(init~, fn(i, b, a) { f(i, b, a) })
} Recommendation
Since the function is deprecated, the current implementation is acceptable. However, if it wasn't being deprecated, it could be optimized to avoid the intermediate list creation from rev() Reasoning
The current implementation creates an intermediate reversed list before folding, which has O(n) space complexity. A direct implementation could avoid this overhead.
Test cases should include deprecation warning verification
Category
Maintainability Code Snippet
test "rev_fold" {
let ls = @list.of(["1", "2", "3", "4", "5"])
let el : @list.T[String] = @list.empty()
inspect(ls.rev().fold(fn(acc, x) { x + acc }, init=""), content="12345")
} Recommendation
Consider adding test cases that verify deprecation warnings are properly emitted when using the deprecated methods Reasoning
Testing deprecation warnings helps ensure the deprecation mechanism works correctly and helps catch any issues with the warning system
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