Benchmark: Map vs Array vs Object vs Set add item speed in 50000 iters 2

Tests:

Map
let randomU32 = function() { return Math.random() * (1 << 31) >>> 0; } let map = new Map(); for (let i = 0; i <= 50000; i++) { map.set(randomU32(), true); }
Array
let randomU32 = function() { return Math.random() * (1 << 31) >>> 0; } let arr = []; for (let i = 0; i <= 50000; i++) { arr[randomU32()] = true; }
Object
let randomU32 = function() { return Math.random() * (1 << 31) >>> 0; } let obj = {}; for (let i = 0; i <= 50000; i++) { obj[randomU32()] = true; }
Set
let randomU32 = function() { return Math.random() * (1 << 31) >>> 0; } let set = new Set(); for (let i = 0; i <= 50000; i++) { set.add(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:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser/OS: Chrome 132 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Map	358.1 Ops/sec
Array	197.8 Ops/sec
Object	205.7 Ops/sec
Set	384.9 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring the performance of different data structures in JavaScript is crucial to understand their strengths and weaknesses.

**Data Structures Comparison**

The benchmark compares the performance of four popular data structures:

1. **Map**: A Map (or dictionary) is an object that stores key-value pairs. In this case, each iteration adds a random key-value pair to the Map.
2. **Array**: An Array is a collection of elements that can be accessed by their index. Here, we're adding a value to an array using a random index.
3. **Object**: An Object (similar to a dictionary) stores key-value pairs but does not maintain any particular order. We're creating an object and adding key-value pairs to it.
4. **Set**: A Set is a collection of unique values, similar to a Map but without keys. In this case, we're adding random values to the Set.

**Options Comparison**

Here's what each option offers:

*   **Fastest execution time**: The data structure with the fastest execution time will likely be preferred in scenarios where speed is critical.
*   **Memory efficiency**: Data structures that use less memory can be beneficial for applications with limited resources.
*   **Cache performance**: The way elements are stored and accessed within a data structure affects cache performance, which impacts overall performance.

**Pros and Cons**

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

### Map

*   Pros:
    *   Fast insertions (average O(1) time complexity)
    *   Good cache locality due to its object-based nature
*   Cons:
    *   Less memory-efficient than other data structures for storing large amounts of unique elements
    *   May not be the best choice for very fast access times, as lookups can take O(1) time

### Array

*   Pros:
    *   Good cache locality due to its contiguous array structure
    *   Can be used with efficient indexing methods like binary search
*   Cons:
    *   Less efficient than Maps or Sets when it comes to insertion (average O(n) time complexity)
    *   May not provide the same level of uniqueness as Sets

### Object

*   Pros:
    *   Good cache locality due to its object-based structure
    *   Can be used with efficient lookup methods like property access
*   Cons:
    *   Less memory-efficient than other data structures, especially when it comes to storing large amounts of unique elements
    *   May not provide the same level of uniqueness as Sets

### Set

*   Pros:
    +   Fast insertions (average O(1) time complexity)
    +   Good cache locality due to its set-based structure
    -   Does not maintain any particular order

Cons:

*   Less memory-efficient than other data structures, especially when it comes to storing large amounts of unique elements
    *   May not be the best choice for very fast access times, as lookups can take O(1) time

**Library Usage**

The benchmark uses several libraries that play a crucial role in its performance:

*   **Math.random()**: Generates random numbers.

**Special JS Features/Syntax**

None mentioned in the provided test cases.

Related benchmarks:

Map vs Array vs Object vs Set add item speed in 50000 iters 2 (version: 0)

Comparing performance of: Map vs Array vs Object vs Set

Created: 4 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

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