Benchmark: Benchmark special field matching

Script Preparation code:

var map = new Map();
var obj = {};
var listOfSpecialFields = ['sync', 'update', 'upsert', 'insert', 'save', 'fields', 'objectType', 'whereClause',
                          'sync2', 'update2', 'upsert2', 'insert2', 'save2', 'fields2', 'objectType2', 'whereClause2']
for (let field of listOfSpecialFields) {
  obj[field] = 1;
  map.set(field, 1);
}

var i = 0, count = 1000, a;

Tests:

Map Has
for (i = 0; i < count; i++) { a = map.has('fields'); }
Object has
for (i = 0; i < count; i++) { a = obj.hasOwnProperty('fields') }
Array has
for (i = 0; i < count; i++) { a = listOfSpecialFields.indexOf('fields') !== -1; }
Double for
for (i = 0; i < count; i++) { a = false; for (let j=0; j<listOfSpecialFields.length; j++) { if (listOfSpecialFields[j] === 'fields') { a = true; break; } } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map Has
Object has
Array has
Double for

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**Benchmark Overview**

The provided JSON represents a benchmark test created on MeasureThat.net, which tests the speed of identifying special fields in different data structures: `Map`, `Object`, and `Array`. The goal is to measure which approach is the fastest.

**Special Fields**

In JavaScript, some properties are considered "special" because they have specific behaviors or implications. These special fields include:

1. `sync`
2. `update`
3. `upsert`
4. `insert`
5. `save`
6. `fields` (also used as an object property)
7. `objectType`
8. `whereClause` (used in MongoDB-like databases)
9. `sync2`, `update2`, `upsert2`, `insert2`, `save2`, `fields2`, and `objectType2` (similar to the first set, but with different names)

These special fields are used as keys or property names in various test cases.

**Test Cases**

There are four individual test cases:

1. **Map Has**: Tests whether a field exists in a `Map` object using `map.has('fields')`.
2. **Object has**: Tests whether an object property exists using `obj.hasOwnProperty('fields')`.
3. **Array has**: Tests whether an element is present in an array using `listOfSpecialFields.indexOf('fields') !== -1`.
4. **Double for**: Tests a nested loop structure to find the first occurrence of `'fields'` in the `listOfSpecialFields` array.

**Approaches Compared**

The benchmark tests compare four approaches:

A) Directly checking existence using `map.has()` or `obj.hasOwnProperty()`
B) Checking if an element is present in an array using `indexOf()`
C) Using a nested loop to find the first occurrence of a value

Each approach has its pros and cons:

* A) **Fastest**, but might be less readable or intuitive.
* B) Relatively fast, but may incur additional overhead due to searching.
* C) Slowest, as it involves an unnecessary loop.

**Pros and Cons**

* Directly checking existence (A): Fast, simple, and widely supported. However, it might not work well in all edge cases or with certain data structures.
* Checking if an element is present in an array (B): Generally fast, but may require additional overhead due to searching.
* Nested loop (C): Slowest, as it involves unnecessary looping.

**Library/Functionality Used**

None, this benchmark does not rely on any external libraries or functions other than standard JavaScript features.

**Special JS Feature/Syntax**

The `Map` data structure and its `has()` method are used in the benchmark. This is a built-in feature of modern JavaScript environments (ECMAScript 2015+).

Other considerations:

* The use of `indexOf()` and nested loops might not be optimal for large datasets or high-performance applications.
* The benchmark only tests specific special fields, which may not represent all possible scenarios.

**Alternatives**

If you were to recreate this benchmark, you could explore additional approaches, such as:

1. Using `in` operator instead of `has()` or `hasOwnProperty()`.
2. Comparing the performance of different data structures (e.g., arrays, objects, sets).
3. Incorporating more complex scenarios, like nested objects or arrays with special fields.
4. Using a more comprehensive set of special fields.

Keep in mind that benchmarking JavaScript performance can be nuanced and dependent on specific environments and use cases.

Related benchmarks:

Benchmark special field matching (version: 0)

Testing speed of identifying when a property is a special field

Comparing performance of: Map Has vs Object has vs Array has vs Double for

Created: 3 years ago by: Guest

Jump to the latest result

Map Has

Object has

Array has

Double for

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):