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feat: add Tap, Transpose, Unzip, ParallelReduce, and Replicate#49

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rjNemo merged 2 commits intomainfrom
feat/issue-21-25-remaining-utilities
Nov 16, 2025
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feat: add Tap, Transpose, Unzip, ParallelReduce, and Replicate#49
rjNemo merged 2 commits intomainfrom
feat/issue-21-25-remaining-utilities

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@rjNemo rjNemo commented Nov 14, 2025

Summary

Implements the remaining functional programming utilities from ACTION_PLAN.md

New Functions

  • Tap (Issue 21): Apply side effects without changing the slice (debugging/logging)
  • Transpose (Issue 22): Flip matrix rows and columns
  • Unzip (Issue 23): Split tuple slice into two separate slices
  • ParallelReduce (Issue 24): Experimental parallel reduction with worker pool
  • Replicate (Issue 25): Create n copies of a value

Implementation

All functions include:

  • Comprehensive tests with edge cases
  • Proper error handling where applicable
  • Pre-allocated memory for optimal performance
  • Clear documentation with examples

Testing

go test -v -run "TestTap|TestTranspose|TestUnzip|TestParallelReduce|TestReplicate"

All tests pass.

Examples

// Tap - for debugging
Tap([]int{1,2,3}, func(n int) { fmt.Println(n) }) // prints each, returns [1,2,3]

// Transpose
Transpose([[1,2,3], [4,5,6]]) // [[1,4], [2,5], [3,6]]

// Unzip
Unzip([Tuple{1,"a"}, Tuple{2,"b"}]) // ([1,2], ["a","b"])

// Replicate
Replicate(3, "hi") // ["hi", "hi", "hi"]

Related

Resolves Issues 21, 22, 23, 24, 25 from ACTION_PLAN.md

🤖 Generated with Claude Code

@rjNemo @claude
feat: add Tap, Transpose, Unzip, ParallelReduce, and Replicate
d6f1e1c 
- Add Tap: for side effects/debugging in pipelines
- Add Transpose: flip matrix rows and columns
- Add Unzip: split tuple slice into two slices
- Add ParallelReduce: parallel reduction (experimental)
- Add Replicate: create n copies of a value

Comprehensive tests included for all functions.

Resolves Issues 21, 22, 23, 24, 25

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
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codecov bot commented Nov 14, 2025 •
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Codecov Report

❌ Patch coverage is 97.46835% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.65%. Comparing base (d622c8c) to head (376ed9a).
⚠️ Report is 12 commits behind head on main.

Files with missing lines Patch % Lines
parallel_reduce.go 95.83% 2 Missing ⚠️
Additional details and impacted files 
@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   98.63%   98.65%   +0.01%     
==========================================
  Files          39       52      +13     
  Lines         367      520     +153     
==========================================
+ Hits          362      513     +151     
- Misses          4        6       +2     
  Partials        1        1
Flag Coverage Δ
unittests 98.65% <97.46%> (+0.01%) ⬆️

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@rjNemo rjNemo force-pushed the feat/issue-21-25-remaining-utilities branch from ec172a2 to e2468fe Compare November 16, 2025 08:00
@rjNemo @claude
test: improve ParallelReduce test coverage to 97.5%
376ed9a 
Add comprehensive tests covering:
- Default workers (workers <= 0)
- Negative workers
- Error handling and propagation
- Context cancellation during execution
- Context timeout
- Single element processing
- Many workers (more workers than elements)
- Benchmark for performance validation

Coverage increased from 68.75% to 97.5%

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
@rjNemo rjNemo force-pushed the feat/issue-21-25-remaining-utilities branch from e2468fe to 376ed9a Compare November 16, 2025 08:02
@rjNemo rjNemo merged commit f33e86d into main Nov 16, 2025
2 checks passed
@rjNemo rjNemo deleted the feat/issue-21-25-remaining-utilities branch November 16, 2025 08:03
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