Benchmark: Map vs Array vs Set vs Object set uint32 key speed fork

Script Preparation code:

var map = new Map();
var arr = [];
var obj = {};
var set = new Set()

function randomU32() {
    return Math.random() * (1 << 31) >>> 0;
}

Tests:

Map
map.set(randomU32(), true); let y = map.has(randomU32()); map.delete(randomU32());
Array
arr[randomU32()] = true; let y = randomU32() in arr; delete arr[randomU32()];
Object
obj[randomU32()] = true; let y = randomU32() in obj; delete obj[randomU32()];
Set
set.add(randomU32()); let y = set.has(randomU32()); set.delete(randomU32());

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map
Array
Object
Set

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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**Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON represents a benchmark with four test cases: Map, Array, Object, and Set.

The benchmark tests the performance of each data structure (Map, Array, Object, and Set) by performing a series of operations:

1. Insertion (adding an element)
2. Search (checking if an element exists)
3. Deletion (removing an element)

**Options Compared**

The benchmark compares the following options:

* **Map**: A JavaScript object that stores key-value pairs. Maps are implemented as hash tables, which provide fast lookup and insertion times.
* **Array**: An ordered collection of values. Arrays are implemented as contiguous blocks of memory, which can be slow for random access operations.
* **Object**: A generic container that can hold any type of value. Objects are essentially maps with string keys, but they can also be used as arrays or sets in certain contexts.
* **Set**: A collection of unique values. Sets are implemented as hash tables, similar to maps, but they only store unique elements.

**Pros and Cons**

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

* **Map**:
	+ Pros: Fast lookup and insertion times (average O(1) time complexity), efficient use of memory.
	+ Cons: Can be slower for deletion operations (average O(1) time complexity).
* **Array**:
	+ Pros: Fast random access, can be used as a stack or queue.
	+ Cons: Slower lookup and insertion times (average O(n) time complexity), less efficient use of memory compared to maps and sets.
* **Object**:
	+ Pros: Generic container that can hold any type of value, can be used as an array or set in certain contexts.
	+ Cons: Can be slower than maps and sets for lookup and insertion operations (average O(1) time complexity), less efficient use of memory compared to maps and sets.
* **Set**:
	+ Pros: Fast membership testing (average O(1) time complexity), efficient use of memory.
	+ Cons: Slower deletion times (average O(1) time complexity).

**Library Used**

None of the test cases use any external libraries. The data structures are implemented natively by JavaScript.

**Special JS Features or Syntax**

None of the test cases use any special JavaScript features or syntax beyond standard ECMAScript 2022 syntax.

**Other Considerations**

When choosing a data structure for your specific use case, consider factors such as:

* **Frequency of insertion and deletion**: If you need to frequently add or remove elements, a set or map might be a better choice.
* **Frequent membership testing**: If you often need to check if an element exists in the collection, a set is likely a better option.
* **Random access**: If you need to access elements at arbitrary positions within the collection, an array might be a better choice.

**Alternatives**

Other data structures that could have been included in this benchmark are:

* **Hash Table**: A more general term for a map or set implementation.
* **Tree-based data structure**: Such as a binary search tree or a balanced tree.
* **Linked List**: An ordered collection of nodes with pointers to each other.

However, these alternatives were not considered in the original benchmark.

Related benchmarks:

Map vs Array vs Set vs Object set uint32 key speed fork (version: 2)

Comparing performance of: Map vs Array vs Object vs Set

Created: 3 years ago by: Registered User

Jump to the latest result

Map

Array

Object

Set

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):