Benchmark: partarum_test1 - MeasureThat.net

Script Preparation code:

var o = {
    "a": 1,
    "b": 2
};

for(let i=0;i<100000;i++){

  o[i.toString()] = "value_" + i;
}

var m = new Map(Object.entries(o));

Tests:

object_in
for(let v in o){ console.log(o[v]); }
map_of
for(let [key, value] of m){ console.log(value); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
object_in
map_of

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's dive into explaining the JavaScript microbenchmark on MeasureThat.net.

**Benchmark Definition JSON**

The benchmark definition represents a simple test case where an object `o` is created and populated with values using a for loop. The object has two properties, `a` and `b`, initialized with values 1 and 2 respectively. Then, another for loop is used to add more properties to the object, where each property's key is converted to a string (using `i.toString()`) and its value is set to `"value_" + i`. Finally, a new Map `m` is created from an object representation of `o` using the spread operator (`Object.entries(o)`).

**Comparison Options**

The benchmark compares two approaches:

1. **Iterating over Object Properties (using `for...in`)**: This approach uses the `for...in` loop to iterate over the properties of the object `o`. The test code looks like this:
```javascript
for(let v in o){
  console.log(o[v]);
}
```
Pros:

* Simple and straightforward.
* Works with objects that support the `for...in` iteration.

Cons:

* Can be slow for large objects due to unnecessary iterations over inherited properties.
* May not work correctly if the object has some special properties (like those defined by a library or framework).

2. **Iterating over Map Values (using `for...of`)**: This approach uses the `for...of` loop to iterate over the values of the Map `m`. The test code looks like this:
```javascript
for(let [key, value] of m){
  console.log(value);
}
```
Pros:

* Efficient and fast for Maps.
* Works correctly even if the Map has some special properties.

Cons:

* Only works with Maps (not objects).
* May not be as intuitive to write code that iterates over a collection.

**Library**

The `Map` data structure is a built-in JavaScript object that provides a way to store and iterate over key-value pairs. It's part of the ECMAScript standard and widely supported across browsers and environments.

**Special JavaScript Feature/Syntax**

None mentioned explicitly in this benchmark definition. However, it's worth noting that the use of `for...in` and `for...of` loops relies on the special syntax for these control flow statements.

**Other Alternatives**

If you're looking for alternative approaches to iterate over objects or Maps, consider:

* Using `Object.keys()` and `forEach()`: This approach uses `Object.keys()` to get an array of keys from the object and then iterates over it using `forEach()`. While it works, it's slightly less efficient than `for...in` or `for...of`.
* Using a library like Lodash (if you're not already using it): Lodash provides utility functions for iterating over objects and arrays, including `$map()` which is similar to `for...of`.

For Maps specifically, consider using the `Map.forEach()` method directly, as it's more efficient and intuitive than writing your own loop.

Keep in mind that these alternatives may have different performance characteristics or require additional setup depending on your specific use case.

Related benchmarks:

partarum_test1 (version: 0)

Ein Test

Comparing performance of: object_in vs map_of

Created: 3 years ago by: Registered User

Jump to the latest result

object_in

map_of

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):