Benchmark: map vs obj2 - MeasureThat.net

HTML Preparation code:

<script src="lodash.js"></script>

Script Preparation code:

var array = [...Array(1000).keys()];
var map = new Map(array.map(a =>[a,a]));
var obj = Object.fromEntries(map);

Tests:

map
for (let i = 0; i< 1000; i++ ){ map.get(i) }
obj
for (let i = 0; i< 1000; i++ ){ obj[i] }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
map
obj

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the provided benchmark and its test cases.

**Benchmark Overview**

The provided benchmark is designed to compare the performance of JavaScript `Map` objects against `Object`s when iterating over their entries. The benchmark measures the execution time for each approach, and the results are compared across different browsers and devices.

**Script Preparation Code**

The script preparation code creates an array of 1000 key-value pairs, converts it into a `Map` object using `Array.prototype.map()` to create arrays for each value, and then converts the `Map` object to an `Object` using `Object.fromEntries()`. This setup is used as the base data structure for both test cases.

**Html Preparation Code**

The HTML preparation code includes a reference to the `lodash.js` library, which is used in one of the test cases. Specifically, the "obj" test case relies on Lodash's `_.at()` function to access the values in the object.

**Test Cases**

There are two test cases:

1. **"map"`**

This test case measures the execution time for accessing a value using the `get()` method of the `Map` object, iterating 1000 times.

Example JavaScript code:
```javascript
for (let i = 0; i < 1000; i++) {
    map.get(i);
}
```
2. **"obj"`**

This test case measures the execution time for accessing a value using the square bracket notation (`[]`) of the `Object`, iterating 1000 times.

Example JavaScript code:
```javascript
for (let i = 0; i < 1000; i++) {
    obj[i];
}
```
**Libraries and Special JS Features**

* Lodash is used in the "obj" test case. It's a popular utility library that provides various functions for tasks like array manipulation, object creation, and more.

**Pros and Cons of Each Approach**

1. **Map.get()**
	* Pros: Efficient way to access values in a `Map` object using its key.
	* Cons: Requires the key to be present in the map; if not, it throws an error.
2. **Object[key]**
	* Pros: Familiar syntax and widely supported by most browsers.
	* Cons: May lead to slower performance due to the need for string interpolation or bracket notation.

**Other Considerations**

* Both test cases are designed to measure the execution time of accessing a value using each approach, rather than measuring the entire map object's performance.
* The benchmark assumes that the `Map` object and `Object` are populated with the same data structure (i.e., key-value pairs).

**Alternatives**

Some alternative approaches could be explored:

1. **Using a native JavaScript data structure**: Consider using a native JavaScript data structure like an array or a `Set`, which may perform better than a `Map` object.
2. **Modifying the test case**: Modify the test cases to measure different aspects of performance, such as indexing, iteration, or even garbage collection.
3. **Using a more specialized library**: Explore using libraries specifically designed for benchmarking JavaScript performance, like Benchmark.js.

I hope this explanation helps! Let me know if you have any further questions.

Related benchmarks:

map vs obj2 (version: 0)

Comparing performance of: map vs obj

Created: 6 years ago by: Guest

Jump to the latest result

map

obj

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):