Benchmark: reflection vs map

Script Preparation code:

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

Tests:

map
Array.from(map.entries()).filter(ent => ent[1]%2 == 0);
reflection
const keys = Object.keys(x); keys.filter(key => x[key]%2==0);

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 provided JSON and explain what's being tested, compared, and their pros/cons.

**Benchmark Definition**

The benchmark compares two approaches: `map` and `reflection`. The test creates an object `x` with 1000 properties (using a for loop), and another object `map` initialized as an empty Map. Both objects are populated with the same values as their respective properties in `x`.

**Options Compared**

1. **Map**: This approach uses a built-in JavaScript data structure, a Map, to store key-value pairs.
2. **Reflection**: This approach uses Object.keys() and Array.prototype.filter() methods to achieve similar results.

**Pros and Cons of Each Approach**

1. **Map**:
	* Pros:
		+ Efficient for large datasets, as lookups are O(1) on average.
		+ Less memory usage compared to using a custom object with similar properties.
	* Cons:
		+ Limited flexibility if you need more complex data structures or operations.
2. **Reflection**:
	* Pros:
		+ More flexible and can be used for any kind of data structure (not limited to maps).
		+ Can be used in scenarios where a custom object is not feasible or desirable.
	* Cons:
		+ Performance may degrade as the dataset grows due to the overhead of iterating over properties and filtering.

**Library: None**

Neither of these approaches relies on external libraries. The `Map` data structure is a built-in JavaScript feature, and Object.keys() and Array.prototype.filter() are part of the standard library.

**Special JS Features/Syntax: None**

There are no special JavaScript features or syntax used in this benchmark. Only standard language constructs are employed.

**Other Considerations**

When deciding between these two approaches, consider the following:

* If you need efficient lookups for large datasets and don't mind using a specific data structure, use `map`.
* If you need flexibility for more complex data structures or scenarios where a custom object is not feasible, use `reflection`.

**Alternatives**

Other alternatives to compare might include:

1. Using an array with objects instead of a map.
2. Implementing your own simple data structure (e.g., a hash table).
3. Comparing the performance of different JavaScript libraries or frameworks that provide similar functionality (e.g., React, Angular).

Related benchmarks:

reflection vs map (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):