Improve the performance of z.nativeEnum

[sluukkonen]

The previous implementation converted the enum into an array of values on each parse call, even though the array was never used in the happy path.

This was especially problematic on large enums, since the work done was proportional to the size of the enum.

I also removed an extra call to util.objectValues on the failure path, since it seemed to be superfluous (util.getValidEnumValues already calls it).

Before:

z.nativeEnum: valid x 4,376,561 ops/sec ±0.65% (95 runs sampled)
z.nativeEnum: invalid x 139,663 ops/sec ±6.37% (91 runs sampled)
long z.nativeEnum: valid x 1,197,450 ops/sec ±0.25% (97 runs sampled)
long z.nativeEnum: invalid x 116,181 ops/sec ±0.46% (96 runs sampled)

After:

z.nativeEnum: valid x 10,978,553 ops/sec ±0.41% (98 runs sampled)
z.nativeEnum: invalid x 143,931 ops/sec ±5.40% (93 runs sampled)
long z.nativeEnum: valid x 9,783,582 ops/sec ±0.38% (99 runs sampled)
long z.nativeEnum: invalid x 122,292 ops/sec ±0.48% (99 runs sampled

Summary by CodeRabbit

• New Features

  • Added new benchmark suites to measure performance of native enum schema parsing, including tests for both short and long enums with valid and invalid inputs.

• Refactor

  • Improved internal handling of enum value retrieval for schema parsing, resulting in more direct value checks without caching in local variables. No changes to public interfaces.

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Walkthrough

This update adds two new benchmark suites for native enum parsing to both Deno and source benchmark files. It also tweaks the internal implementation of the ZodNativeEnum class by removing a local variable that cached valid enum values, opting for direct utility calls instead. No public APIs are changed.

Changes

File(s)	Change Summary
deno/lib/benchmarks/primitives.ts, src/benchmarks/primitives.ts	Added nativeEnumSuite and longNativeEnumSuite for benchmarking native enum parsing; included them in exports.
deno/lib/types.ts, src/types.ts	Removed local caching of valid enum values in ZodNativeEnum._parse; now directly calls utility function at each use.

Sequence Diagram(s)

sequenceDiagram
    participant BenchmarkSuite
    participant ZodNativeEnum
    participant Util

    BenchmarkSuite->>ZodNativeEnum: parse(input)
    ZodNativeEnum->>Util: getValidEnumValues(enumDef)
    Util-->>ZodNativeEnum: validValues
    ZodNativeEnum->>ZodNativeEnum: check input against validValues
    ZodNativeEnum-->>BenchmarkSuite: result (success or error)

Loading

Poem

Two new suites join the race,
Native enums now set the pace.
No more caching on the side,
Utility calls take the ride.
Benchmarks run, results in tow—
Enum parsing, watch it go!
🚀

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📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 8c7b5db and ded6dd3.

📒 Files selected for processing (4)

• deno/lib/benchmarks/primitives.ts (2 hunks)
• deno/lib/types.ts (2 hunks)
• src/benchmarks/primitives.ts (2 hunks)
• src/types.ts (2 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: Test with Deno v1.x

🔇 Additional comments (11)

src/benchmarks/primitives.ts (3)

58-88: New benchmark suite added for z.nativeEnum

Nice addition of benchmark suites for native enum parsing! This matches the PR's goal of improving the performance of z.nativeEnum.

---

74-88: Additional benchmarks for large native enums

Adding specific benchmark for large enums is super helpful for validating performance improvements, especially since the PR summary mentioned that the optimization is particularly impactful for large enums.

---

199-200: Updated exports to include new benchmark suites

Properly added the new benchmark suites to the exported suite list. This ensures the new benchmarks will be run along with the existing ones.

deno/lib/types.ts (3)

4464-4494: Optimized ZodNativeEnum._parse method by removing unnecessary cached values

This is the key performance improvement! You've eliminated the local variable that was previously storing the result of util.getValidEnumValues(this._def.values) on every parse call. Instead, you're now calling the function directly only when needed.

By avoiding the array creation on the successful parsing path (which is the most common), you've significantly improved performance, especially for large enums.

---

4466-4476: Streamlined error handling for invalid types

Nice cleanup of the error handling path too - directly using util.getValidEnumValues instead of a cached variable keeps the code simpler.

---

4483-4485: Improved error handling for invalid enum values

Continuing the pattern - removed the cached variable here too and directly used util.getValidEnumValues. This prevents duplicated work since util.getValidEnumValues was already doing what was needed.

src/types.ts (2)

4465-4469: Nice performance optimization here! 👍

You removed the local variable that cached the results of util.getValidEnumValues and instead directly call the function when needed. This avoids unnecessary array conversion on every parse call, which is especially helpful for large enums.

---

4484-4485: Consistent with the pattern of direct access

Same approach here - directly calling util.getValidEnumValues instead of using a cached array. This keeps the code consistent with the change above and avoids redundant processing.

deno/lib/benchmarks/primitives.ts (3)

58-72: Good addition of benchmarks for nativeEnum

Adding dedicated benchmarks for z.nativeEnum makes sense to measure the performance impact of your implementation changes. The structure mirrors the existing enum benchmarks which helps with comparison.

---

74-88: Smart to test with large enum values too

Testing with both regular and large enum values is especially important since the performance improvement should be more noticeable with larger enums. This benchmark will help validate that claim in the PR description.

---

199-200: Don't forget to include the new benchmarks

Good job adding the new benchmark suites to the exported suites array - this ensures they'll be run as part of the benchmark suite.

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• 📝 Generate Docstrings

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