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@manojvas manojvas commented Nov 30, 2025

Benchmark PR

Recreated from upstream for CRA evaluation benchmarking.

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Original Description

Use the existing slice variable instead of Array.prototype.slice for consistency and to avoid repeated property lookups.

No behavior change. All tests pass. Linting clean.

Closes expressjs#6896

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bito-code-review bot commented Nov 30, 2025

Code Review Agent Run #2c579f

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bito-code-review bot commented Nov 30, 2025

Changelist by Bito

This pull request implements the following key changes.

Key Change Files Impacted
Feature Improvement - Optimized Array Slicing Usage

application.js - Replaced Array.prototype.slice with a cached slice function to reduce repetitive property lookups and improve performance during server initialization.

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Interaction Diagram by Bito
sequenceDiagram
participant Dev as Developer
participant Module as application.js Module<br/>🔄 Updated | ●●● High
participant App as Express App Instance
participant Listen as app.listen()<br/>🔄 Updated | ●●● High
participant HTTPSrv as http.createServer()
participant Server as HTTP Server Instance
participant Callback as Callback Function
Note over Module: Module initialization<br/>slice cached at line 33
Dev->>Module: require('express')
Module->>App: createApplication()
App->>App: app.init()
Dev->>App: app.listen(port, callback)
App->>Listen: Invoke listen method
Listen->>Listen: var args = slice.call(arguments)
Listen->>HTTPSrv: http.createServer(this)
HTTPSrv->>Server: Return server instance
Listen->>Listen: Wrap callback with once()
Listen->>Server: server.listen.apply(server, args)
Server->>Callback: Invoke callback
Callback-->>Dev: Server ready
Loading

Critical path: Developer->application.js Module->Express App Instance->app.listen() (MODIFIED)->HTTP Server Instance

Note: This MR optimizes app.listen() by using a pre-cached slice reference (defined at module load) instead of accessing Array.prototype.slice on each invocation. This reduces property lookup overhead during server startup with no behavioral change.

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manojvas commented Dec 1, 2025

Code Review Agent Run #8f4b27

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manojvas commented Dec 1, 2025

Code Review Agent Run #ce5493

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manojvas commented Dec 1, 2025

Code Review Agent Run #d4dde4

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    • lib/application.js
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Minor Cleanup: Use Cached slice Reference in app.listen Implementation

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