Benchmark: map Vs object vs array3

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:

map test for merge
const items =[...map1.values(), ...map2.values(),]
map.values()
const items = map1.values();
object merge
const items = [...Object.values(obj1), ...Object.values(obj2),]
object values
const items =Object.values(obj1)
array merge
const items =[...arr1, ...arr2,]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
map test for merge
map.values()
object merge
object values
array merge

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

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Let's break down the benchmark and its test cases.

**Benchmark Overview**

The benchmark measures the performance of different JavaScript data structures: Maps, Arrays, and Objects. Specifically, it tests how these data structures can be merged or iterated over.

**Data Structures Comparison**

The benchmark provides three types of data structures:

1. **Maps**: A Map is a collection of key-value pairs where each key is unique.
2. **Arrays**: An Array is a collection of values that are stored in contiguous memory locations.
3. **Objects**: An Object is an unordered collection of key-value pairs, similar to a Map.

**Options Compared**

The benchmark compares the following options:

1. **Map Values**: Iterating over the values of a Map using the `values()` method.
2. **Array Merge**: Merging two Arrays into one using the spread operator (`...`).
3. **Object Values**: Iterating over the values of an Object using the `values()` method.
4. **Object Merge**: Merging two Objects into one.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

1. **Map Values**:
	* Pros: Efficient for large datasets, as it avoids iterating over keys.
	* Cons: May require additional memory to store the Map, and iteration can be slower than other methods.
2. **Array Merge**:
	* Pros: Fast and memory-efficient, as it uses contiguous memory locations.
	* Cons: May not perform well for very large datasets, and requires careful handling of edge cases (e.g., duplicate values).
3. **Object Values**:
	* Pros: Similar to Map Values, but may be faster due to the simplicity of iteration.
	* Cons: Requires additional memory to store the Object, and iteration can be slower than other methods for very large datasets.
4. **Object Merge**:
	* Pros: Can handle complex merging scenarios, such as nested objects.
	* Cons: May be slower and more memory-intensive than Array Merge.

**Library Usage**

The benchmark uses the `Map` data structure from the JavaScript standard library, which is built-in to most modern browsers and Node.js implementations. The `Array` data structure is also part of the standard library, while the `Object` data structure is implemented using the same syntax as a Map.

**Special JS Features/Syntax**

None of the test cases use any special JavaScript features or syntax beyond what's required for basic iteration and merging.

**Alternatives**

Other alternatives to these approaches include:

1. **Destructuring**: Using destructuring assignment (e.g., `const [a, b] = arr`) to extract values from an Array.
2. **Spread Operators with Rest Parameters**: Using the spread operator (`...`) with rest parameters (e.g., `function merge(a, b) { return [...a, ...b]; }`) to merge Arrays.
3. **Object Comprehensions**: Using object comprehensions (e.g., `const obj = Object.fromEntries([['a', 1], ['b', 2]])`) to create new Objects.

Keep in mind that these alternatives may have different performance characteristics or require additional setup, so they might not be suitable for all use cases.

Related benchmarks:

map Vs object vs array3 (version: 0)

Comparing performance of: map test for merge vs map.values() vs object merge vs object values vs array merge

Created: 3 years ago by: Guest

Jump to the latest result

map test for merge

map.values()

object merge

object values

array merge

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):