Benchmark: Map() vs Object() on write no strings

Tests:

Map
const test = new Map() for (var i=100000; i > 0; i--) { test.set(i, `value${i}`) }
Object Iteration
const test = {} for (var i=100000; i > 0; i--) { test[i] = `value${i}` }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map
Object Iteration

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Safari/605.1.15

Browser/OS: Safari 17 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Map	134.8 Ops/sec
Object Iteration	82.9 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and the pros/cons of each approach.

**Benchmark Overview**

The benchmark measures the performance difference between using `Map` and `Object` data structures in JavaScript for large-scale iteration. The test creates a map or an object with 100,000 key-value pairs, where each key is a unique integer and the value is a string concatenating "value" and the key.

**Test Cases**

There are two individual test cases:

1. **Map**: This test case uses `Map` data structure to store key-value pairs.
```javascript
const test = new Map();
for (var i=100000; i > 0; i--) {
  test.set(i, `value${i}`);
}
```
2. **Object Iteration**: This test case uses an object literal to store key-value pairs.
```javascript
const test = {};
for (var i=100000; i > 0; i--) {
  test[i] = `value${i}`;
}
```
**Comparison**

The benchmark compares the performance of these two approaches:

* **Map**: Uses a hash table data structure, which is optimized for fast lookups and inserts.
* **Object Iteration**: Uses an object literal with key-value pairs, where each property is accessed using bracket notation (e.g., `test[i]`).

**Pros/Cons**

Here are the pros and cons of each approach:

**Map**

Pros:

* Fast lookups and inserts due to hash table implementation
* Efficient memory usage for large datasets

Cons:

* May have slower iteration compared to object iteration, as the browser needs to iterate over the keys and values in the map.
* Requires a `Map` object creation, which may incur some overhead.

**Object Iteration**

Pros:

* Can be faster for iteration due to direct access to properties using bracket notation
* Simpler implementation and no additional object creation required

Cons:

* May have slower performance due to hash table lookups and inserts compared to map operations.
* Memory usage can be higher due to the need to store all key-value pairs in memory.

**Other Considerations**

* **ES6 Map**: The `Map` data structure is a native JavaScript data structure introduced in ES6. It provides efficient methods for adding, removing, and iterating over key-value pairs.
* **Browser Support**: Both Safari 17 (on Mac OS X 10.15.7) results are provided, indicating that both approaches are supported by the browser.

**Other Alternatives**

If you're interested in exploring alternative data structures or optimization techniques, consider the following:

* **Array**: Using an array and indexing can be a viable alternative to `Map` or object iteration.
* **Set**: The `Set` data structure is another native JavaScript data structure that provides efficient methods for adding and removing elements.

Related benchmarks:

Map() vs Object() on write no strings (version: 0)

Comparing performance of: Map vs Object Iteration

Created: 2 years ago by: Guest

Jump to the latest result

Map

Object Iteration

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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