Benchmark: map Vs object vs array2

Script Preparation code:

var map1 = new Map();
map1.set('a1', 1);
map1.set('b1', 2);
map1.set('c1', 3);
map1.set('d1', 4);
map1.set('a', 5);
var map2 = new Map();
map2.set('a2', 1);
map2.set('b2', 2);
map2.set('c2', 3);
map2.set('d2', 4);
map2.set('a', 5);

var obj1 = {
    'a1': 1,
    'b1': 2,
    'c1': 3,
    'd1': 4
};
var obj2 = {
    'a2': 1,
    'b2': 2,
    'c2': 3,
    'd2': 4
};

var arr1 = [1, 2, 3, 4];
var arr2 = [5, 6, 7, 8];

Tests:

1
[...map1.values(), ...map2.values(),]
1.2
map1.values();
2
[...Object.values(obj1), ...Object.values(obj2),]
2.2
Object.values(obj1)
3
[...arr1, ...arr2,]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
1.2
2
2.2
3

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 explaining the provided benchmark.

**Benchmark Overview**

The provided benchmark compares the performance of different methods to retrieve values from data structures: `Map`, `Object`, and arrays (`array`).

**Test Cases**

There are four individual test cases:

1. **Retrieve all values from a Map**: The test case uses `[...map1.values(), ...map2.values()]` (case 1), `map1.values()`, `[...Object.values(obj1), ...Object.values(obj2)]` (case 2), and `Object.values(obj1)` (case 2.2). These tests aim to measure the performance of different methods to retrieve all values from a Map.
2. **Retrieve a value from a Map**: The test case uses `map1.values()` (case 1.2) and `Object.values(obj1)` (case 2.2).
3. **Retrieve all values from an array**: The test case uses `[...arr1, ...arr2]` (case 3).

**Data Structures**

The benchmark uses the following data structures:

* Two `Map`s (`map1` and `map2`) with four key-value pairs each.
* Two objects (`obj1` and `obj2`) with four properties each.
* Two arrays (`arr1` and `arr2`) with four elements each.

**Library**

The benchmark uses the following libraries:

* None explicitly mentioned, but it's worth noting that JavaScript doesn't have a native "Map" library, as Maps are built-in objects in modern browsers. However, if you're running this benchmark in a Node.js environment or a different context, it might use the `map` function from the `Array.prototype` or an external library.

**Special JS Feature/Syntax**

None mentioned explicitly in this benchmark.

**Performance Comparison**

The performance of these methods can be influenced by various factors:

* **Map**: Using `[...map1.values(), ...map2.values()]` might be slower due to the overhead of creating a new array, while `map1.values()` is likely faster as it returns an iterator.
* **Object**: Similar to `Map`, using `[...Object.values(obj1), ...Object.values(obj2)]` might be slower than just calling `Object.values(obj1)` because of the extra iteration.

**Pros and Cons**

Here are some pros and cons for each approach:

* **[...map1.values(), ...map2.values()]**: Pros - returns all values from both Maps, Cons - creates a new array and iterates over it.
* **map1.values()**: Pros - faster as it returns an iterator, but only returns one Map's values. Cons - might be slower if you need to process the values in both Maps simultaneously.
* **[...Object.values(obj1), ...Object.values(obj2)]**: Pros - similar to `Map`, but works with objects, Cons - might be slower due to extra iteration and creating a new array.
* **Object.values(obj1)**: Pros - faster as it returns an iterator, Cons - only returns values from one object.

**Other Alternatives**

If you need to compare performance of these methods in different contexts or languages, consider the following alternatives:

* For Node.js environments: Use the `map` function from the `Array.prototype` for arrays and `Object.keys()`/`Object.values()` for objects.
* For browser-based development: Use built-in `Map`, `Object`, and array methods.
* For other programming languages: Research language-specific equivalents of these methods, such as Python's `dict` or Java's `HashMap`.

I hope this explanation helps you understand the provided benchmark!

Related benchmarks:

map Vs object vs array2 (version: 0)

Comparing performance of: 1 vs 1.2 vs 2 vs 2.2 vs 3

Created: 3 years ago by: Guest

Jump to the latest result

1

1.2

2

2.2

3

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):