refactor: avoid unnecessary assignment in blas/ext/base siblings

[Planeshifter]

Description

This pull request:

• Propagates the refactor from 3ceff10 (refactor: avoid unnecessary assignment) to sibling blas/ext/base/*last-index-of packages, collapsing the redundant idx = N - 1 - idx; return idx; sequence into a single return N - 1 - idx;. Target packages:
  • blas/ext/base/dlast-index-of
  • blas/ext/base/slast-index-of

Related Issues

None.

Questions

No.

Other

Validation: pattern search scoped to blas/ext/base/*/lib/ndarray.js, followed by two independent adversarial passes and a style-consistency check confirming each target is textually identical to the source's pre-refactor shape. Deliberately excluded: the equivalent src/main.c sequences in the same packages, since the source commit did not touch C.

Checklist

• Read, understood, and followed the contributing guidelines.

AI Assistance

• Yes
• No

If you answered "yes" above, how did you use AI assistance?

• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding

Disclosure

This PR was authored by an automated Claude Code routine that propagates recent develop fixes to sibling packages with the same defect pattern. Pattern detection, candidate-site validation, and patch generation were AI-assisted; the resulting diff is the verbatim analog of 3ceff10.

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@stdlib-js/reviewers

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Generated by Claude Code

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
blas/ext/base/dlast-index-of	$\\color{green}363/363$ $\\color{green}+100.00\\%$	$\\color{green}17/17$ $\\color{green}+100.00\\%$	$\\color{green}4/4$ $\\color{green}+100.00\\%$	$\\color{green}363/363$ $\\color{green}+100.00\\%$
blas/ext/base/slast-index-of	$\\color{green}363/363$ $\\color{green}+100.00\\%$	$\\color{green}17/17$ $\\color{green}+100.00\\%$	$\\color{green}4/4$ $\\color{green}+100.00\\%$	$\\color{green}363/363$ $\\color{green}+100.00\\%$

The above coverage report was generated for the changes in this PR.