Benchmark: reflection vs map: access

Script Preparation code:

var map = new Map();
var x = {};
for(let i = 0; i< 1000; i++){
    map.set(i, i);
    x[i] = i;
}

Tests:

map
for(let i = 0; i< 1000; i++){ map.get(i); }
reflection
for(let i = 0; i< 1000; i++){ x[i] }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
map
reflection

Fastest: N/A

Slowest: N/A

Latest run results:

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

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I'll break down the benchmark and explain what's being tested, compared options, pros and cons, library usage, special JS features, and alternatives.

**Benchmark Overview**

The MeasureThat.net website allows users to create and run JavaScript microbenchmarks. The provided benchmark compares the performance of two approaches: using a `Map` object (option 1) versus using reflection (option 2) to access elements in an array.

**Script Preparation Code**

The script preparation code creates an empty `Map` object (`var map = new Map();`) and another object (`var x = {};`) with 1000 properties initialized. The test then sets 1000 key-value pairs on the `map` object using `map.set(i, i);`, and assigns corresponding values to the `x` object's properties using `x[i] = i;`.

**Individual Test Cases**

The benchmark consists of two test cases:

1. **Map**: Iterates over the `map` object using `for...of` loop and accesses each element using `map.get(i)`.
2. **Reflection**: Iterates over an array (assumed to be generated by the script preparation code) using `for...of` loop and accesses each element using the reflection syntax (`x[i]`).

**Comparison**

The two test cases are designed to measure the performance difference between accessing elements in a `Map` object versus using reflection. The comparison is likely aimed at understanding the overhead of reflection vs. the direct lookup mechanism provided by `Map`.

**Pros and Cons**

**Option 1: Map**

Pros:

* Direct access to elements via `map.get(i)` is typically faster than reflection.
* Maps are optimized for fast lookups, making them suitable for this use case.

Cons:

* May not be as widely supported or available in older browsers that don't implement the `Map` API.

**Option 2: Reflection**

Pros:

* Can be used in situations where a specific object is known at runtime.
* May be more flexible than using a map to store and retrieve data.

Cons:

* Typically slower than direct access via `map.get(i)` due to the overhead of reflection.
* Can lead to performance issues if not implemented carefully, as it involves creating a new function on each iteration.

**Library Usage**

The benchmark uses the built-in `Map` object, which is a part of the JavaScript standard library. No additional libraries are required.

**Special JS Features**

There are no special JS features mentioned in this benchmark. It's focused on comparing two approaches to accessing elements in an array/map.

**Alternatives**

Other alternatives for accessing elements in an array or map could include:

* Using `Array.prototype.forEach()` instead of `for...of` loop.
* Utilizing other data structures like objects, sets, or arrays with optimized lookup methods (e.g., sparse arrays).
* Leveraging browser-specific APIs or extensions (e.g., Web Storage) for fast key-value storage.

Keep in mind that this benchmark is designed to compare specific approaches and may not cover all possible use cases.

Related benchmarks:

reflection vs map: access (version: 0)

Comparing performance of: map vs reflection

Created: 3 years ago by: Registered User

Jump to the latest result

map

reflection

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):