#13 - implemented ValuesRev() methods

[maciej-sz]

Summary by CodeRabbit

• New Features
  • Introduced reverse order iteration for collections, allowing users to retrieve elements in descending order for enhanced data exploration.
• Tests
  • Expanded test scenarios validate the reverse iteration behavior—including early termination cases—to ensure robust and reliable functionality.

[coderabbitai]

Walkthrough

This pull request implements reverse iteration functionality throughout the collections library. The Ordered interface in definitions.go now actively defines a ValuesRev() method while removing previously commented-out methods. Similar reverse iteration methods have been added for map and sequence types (i.e., comfyMap, comfyCmpMap, comfySeq, and comfyCmpSeq) to yield elements in reverse order. In addition, test cases and helper functions have been introduced across various test files to validate both normal iteration and early break scenarios, ensuring comprehensive coverage of the new reverse value retrieval capabilities.

Changes

File(s)	Change Summary
definitions.go	Removed commented-out ValuesOrdered() and ValuesRev() method signatures; added active ValuesRev() iter.Seq[V] method in the Ordered[V any] interface.
map.go, mapcmp.go	Added ValuesRev() methods to comfyMap[K, V] and comfyCmpMap[K, V] to enable reverse order iteration via a yield function over internal slices.
map_cases_test.go, map_test.go, mapcmp_test.go	Introduced new test functions and cases (testMapValuesRev, testMapValuesRevBreak, and related functions) for validating reverse iteration, including break cases.
ordered_cases_test.go	Added test cases and functions (getValuesRevCases, testValuesRev, getValuesRevBreakCases, testValuesRevBreak) for reverse iteration in ordered collections.
sequence.go, sequencecmp.go	Added ValuesRev() methods to comfySeq[V] and comfyCmpSeq[V] that return reverse iterators by traversing the underlying slices from last to first.
sequence_test.go, sequencecmp_test.go	Added new test functions (Test_comfySeq_ValuesRev and Test_comfyCmpSeq_ValuesRev) to ensure correct reverse iteration behavior in sequence implementations.

Sequence Diagram(s)

sequenceDiagram
    participant T as Test Caller
    participant CM as comfyMap/comfyCmpMap
    participant Y as Yield Function
    T->>CM: Invoke ValuesRev()
    loop Reverse iteration over collection
        CM->>Y: Yield element (starting from last index)
        Y-->>CM: Return true/false (continue loop)
    end
    CM-->>T: Return reverse sequence iterator

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sequenceDiagram
    participant T as Test Caller
    participant CS as comfySeq/comfyCmpSeq
    participant Y as Yield Function
    T->>CS: Call ValuesRev()
    loop Reverse iteration over sequence
        CS->>Y: Yield element (from last to first)
        Y-->>CS: Continue or break check
    end
    CS-->>T: Provide reverse sequence iterator

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Possibly related PRs

• #13 - Moving order-rely methods to Linear interface #23: Introduced reverse iteration methods like EachRev and FoldRev in the Linear interface, closely aligning with the reverse iteration functionality added in this pull request.

Poem

I'm a coding rabbit, quick on my feet,
Reversing the code with a delightful beat.
Values flow backward, a curious new track,
Hop by hop, I bring reverse order back.
In my burrow of code, every change sings—🐰 cheers to new things!

Warning

There were issues while running some tools. Please review the errors and either fix the tool’s configuration or disable the tool if it’s a critical failure.

🔧 golangci-lint (1.62.2)

Error: can't load config: the Go language version (go1.23) used to build golangci-lint is lower than the targeted Go version (1.24)
Failed executing command with error: can't load config: the Go language version (go1.23) used to build golangci-lint is lower than the targeted Go version (1.24)

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📥 Commits

Reviewing files that changed from the base of the PR and between aa87a8a and 19af1ff.

📒 Files selected for processing (11)

• definitions.go (1 hunks)
• map.go (1 hunks)
• map_cases_test.go (1 hunks)
• map_test.go (1 hunks)
• mapcmp.go (1 hunks)
• mapcmp_test.go (1 hunks)
• ordered_cases_test.go (2 hunks)
• sequence.go (1 hunks)
• sequence_test.go (1 hunks)
• sequencecmp.go (1 hunks)
• sequencecmp_test.go (1 hunks)

🔇 Additional comments (17)

sequence.go (1)

257-265: Implementation looks good!

The ValuesRev() method correctly implements reverse iteration over the sequence elements, following the same pattern as the existing Values() method. The implementation properly handles early termination when the yield function returns false.

mapcmp.go (1)

408-416: Well-implemented reverse iteration

The ValuesRev() method provides a clean implementation for reverse iteration over map entries. It correctly follows the established pattern from other reverse iteration methods in the codebase and properly handles early termination.

map.go (1)

325-333: Good implementation of reverse iteration

The implementation of ValuesRev() follows the same pattern as in other collection types, providing consistent behavior across the library. The method correctly iterates in reverse order and handles early termination appropriately.

sequencecmp.go (2)

351-359: Consistent implementation of reverse iteration

The ValuesRev() method maintains consistency with other reverse iteration implementations in the codebase. The code correctly iterates through elements in reverse order and properly handles early termination.

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361-361: Minor comment style change

The "Private:" comment has been added to maintain consistent code organization between public and private methods.

sequence_test.go (1)

279-282: Good implementation of ValuesRev tests

The addition of the Test_comfySeq_ValuesRev function correctly tests both normal reverse iteration and early-breaking scenarios for sequence values, following the same pattern as other test functions in this file.

sequencecmp_test.go (1)

351-354: Good implementation of ValuesRev tests for CmpSeq

The implementation follows the established testing pattern in the file and correctly tests both normal reverse iteration and early-breaking scenarios using the appropriate collection builder.

map_test.go (1)

331-334: Good implementation of ValuesRev tests for maps

The addition of Test_comfyMap_ValuesRev properly tests the reverse value iteration functionality for map collections, checking both normal iteration and early-breaking scenarios.

mapcmp_test.go (1)

395-398: Good implementation of ValuesRev tests for comparison maps

The test function is well-implemented, following the established pattern for testing map functionality and correctly using the appropriate test helpers for verifying reverse iteration behavior.

definitions.go (1)

118-118: Well implemented addition of ValuesRev() method to the Ordered interface

Good job implementing this method to complement the existing reverse iteration methods like EachRev, FindLast, etc. This makes the API more consistent by providing a way to get an iterator over elements in reverse order.

ordered_cases_test.go (5)

5-5: Correctly added the slices package import

The import of the slices package is appropriate for using slices.Collect in the test functions.

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770-788: Good test cases for ValuesRev

These test cases cover empty collections, one-item collections, and multi-item collections, which ensure comprehensive testing of the ValuesRev() method. The expected results correctly represent the reverse order of elements.

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790-800: Well implemented test function

The test function correctly collects elements from the iterator and compares them against the expected results. The use of slices.Collect is an elegant way to handle the iterator.

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802-835: Thorough testing for early-break scenarios

These test cases effectively verify the early-break behavior for various conditions, ensuring the iterator correctly handles breaking at different points in the collection.

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837-853: Good implementation of break testing

The test function properly simulates early-breaking during iteration by manually iterating through the sequence and breaking based on predicate results. This ensures the ValuesRev method properly supports breaking out of the iteration early.

map_cases_test.go (2)

3356-3386: Well-implemented test cases for ValuesRev functionality.

The new getMapValuesRevCases and testMapValuesRev functions properly test the reverse iteration functionality for maps, covering empty collections, single-item collections, and multi-item collections. The test cases verify that values are returned in the correct reverse order.

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3388-3439: Good coverage of early termination scenarios for ValuesRev.

The getMapValuesRevBreakCases and testMapValuesRevBreak functions properly test early break scenarios, ensuring that the ValuesRev iterator works correctly when iterations are terminated early. The test cases cover immediate termination, breaking in the middle, and breaking after processing multiple items.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
definitions.go	100.00% <ø> (ø)
map.go	100.00% <100.00%> (ø)
mapcmp.go	100.00% <100.00%> (ø)
sequence.go	100.00% <100.00%> (ø)
sequencecmp.go	100.00% <100.00%> (ø)

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