Benchmark: object fill test

Tests:

for loop
const object = {}; for (let i=0; i<1440; i++) { object[i] = { foo: 'bar', count: 0, users: new Set(), }; }
array fill map
const object = {}; new Array(1440).fill().map((_, n) => object[n] = { foo: 'bar', count: 0, users: new Set(), });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for loop
array fill map

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

The test being measured on MeasureThat.net is the performance of creating and populating an object in JavaScript.

In this benchmark, there are two different approaches to create and populate an object:

1. **For Loop Approach**:
```javascript
for (let i = 0; i < 1440; i++) {
    object[i] = {
        foo: 'bar',
        count: 0,
        users: new Set()
    };
}
```
This approach uses a traditional for loop to iterate over an array of numbers, and on each iteration, it creates a new object with the required properties and assigns it to a specific index in the `object` variable.

Pros:

* This approach is simple and easy to understand.
* It allows for direct control over the creation of objects using a familiar loop structure.

Cons:

* This approach can be slower due to the overhead of the explicit loop, especially for large numbers of iterations.

2. **Array Fill Map Approach**:
```javascript
new Array(1440).fill().map((_, n) => object[n] = {
    foo: 'bar',
    count: 0,
    users: new Set()
});
```
This approach uses the `fill()` method to create an array of length 1440, and then maps over this array using an arrow function. On each iteration of the map function, it assigns a new object with the required properties to a specific index in the `object` variable.

Pros:

* This approach is concise and efficient.
* It allows for a more modern and expressive way of creating objects in JavaScript.

Cons:

* The `fill()` method can be slower for very large arrays due to the overhead of allocating memory. However, this effect is likely negligible in most cases.

In general, the Array Fill Map Approach is likely to be faster than the For Loop Approach, as it uses modern JavaScript features that are optimized by the engine. However, the actual performance difference may vary depending on the specific JavaScript engine being used and other factors such as available memory and system resources.

There are other alternatives for creating objects in JavaScript, such as using the `Object.create()` method or constructors like `Object.assign()`. However, these approaches are less commonly used and may not be as efficient as the Array Fill Map Approach.

Related benchmarks:

object fill test (version: 0)

Comparing performance of: for loop vs array fill map

Created: 4 years ago by: Guest

Jump to the latest result

for loop

array fill map

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):