Benchmark: Map vs Obj12332 - MeasureThat.net

Script Preparation code:

var obj = {},
    map = new Map(),
    n = 1000000;

Tests:

Map Test
for (let i = 0; i < n; i++) { map.set(i, i); }
Obj test
for (let i = 0; i < n; i++) { obj[i] = i; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map Test
Obj test

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):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is tested, compared options, pros and cons of those approaches, and other considerations.

**Benchmark Overview**

The MeasureThat.net website provides a platform for creating and running JavaScript microbenchmarks. The current benchmark, "Map vs Obj32", compares the performance of two data structures: `Map` and an object (`obj`). Both data structures are used to store 1 million elements (n = 1000000) with unique integer keys.

**Script Preparation Code**

The script preparation code is a snippet that initializes both data structures before running the benchmark:
```javascript
var obj = {}, map = new Map(), n = 1000000;
```
This code creates an empty object `obj` and a new `Map` instance `map`. The variable `n` is set to 1,000,000.

**Individual Test Cases**

There are two test cases:

1. **Map Test**: This test case uses the `Map` data structure and sets each key to its corresponding value using `map.set(i, i)`.
2. **Obj Test**: This test case uses an object (`obj`) and sets each property to its corresponding value using `obj[i] = i`.

**Library and Purpose**

In both test cases, a library is not explicitly used. However, the `Map` data structure in JavaScript is based on the ECMAScript standard and provides a built-in implementation.

**Special JS Feature or Syntax**

The benchmark does not use any special JavaScript features or syntax. It only relies on the standard data structures and operations provided by JavaScript.

**Comparison of Options**

The main comparison here is between using an object (`obj`) versus a `Map` data structure to store 1 million elements. Both approaches have their pros and cons:

* **Object (`obj`)**:
	+ Pros:
		- Easy to implement and understand.
		- No additional library or framework required.
	+ Cons:
		- Can lead to slower performance due to property lookup using bracket notation (`[key]`) which can be slower than direct key access in a `Map`.
* **`Map` data structure**:
	+ Pros:
		- Provides faster performance for key-value lookups and insertions, thanks to its internal hash table implementation.
	+ Cons:
		- May require additional library or framework (in this case, JavaScript's built-in `Map` implementation).

**Other Considerations**

When choosing between using an object (`obj`) versus a `Map` data structure, consider the following:

* **Performance**: If performance is critical and you need to frequently insert or retrieve values by key, use a `Map`.
* **Complexity**: If simplicity and ease of understanding are more important, use an object.
* **Browser support**: Both approaches work in modern browsers. However, some older browsers might have limited support for the `Map` data structure.

**Alternatives**

Other alternatives to using an object or a `Map` data structure include:

* Using other data structures like `Set`, `ArrayBuffer`, or even custom arrays.
* Employing caching mechanisms or memoization techniques to optimize performance.
* Considering alternative programming languages or frameworks that provide more efficient data structures and operations.

In summary, the "Map vs Obj32" benchmark provides a simple yet informative comparison of two common data structures in JavaScript. Understanding the pros and cons of each approach can help developers make informed decisions when choosing between object-oriented and key-value based data structures in their own projects.

Related benchmarks:

Map vs Obj12332 (version: 0)

Comparing performance of: Map Test vs Obj test

Created: 5 years ago by: Guest

Jump to the latest result

Map Test

Obj test

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):