Benchmark: test array setting value

Script Preparation code:

var object = {
    a: [],
    b: [],
    c: []
};
var timeout = setTimeout((v) => console.log(v), 100);

Tests:

push
object["c"].push(timeout)
unshift
object["c"].unshift(timeout)
set
object["c"] = [timeout]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
push
unshift
set

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.

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

**Benchmark Overview**

The benchmark tests the performance of different approaches for setting values in an array:

1. `push`
2. `unshift`
3. `set`

The benchmark uses a JavaScript object with three empty arrays (`a`, `b`, and `c`). The `timeout` variable is set using `setTimeout` to simulate a time-consuming operation.

**Benchmark Preparation Code**

The preparation code sets up the test environment:
```javascript
var object = {
  a: [],
  b: [],
  c: []
};
var timeout = setTimeout((v) => console.log(v), 100);
```
This code creates an object with three empty arrays and sets a `timeout` variable using `setTimeout`, which will log a value after a delay of 100ms.

**Individual Test Cases**

The benchmark consists of three test cases, each testing a different approach:

1. **Push**: `object["c"].push(timeout)`
	* This test case pushes the `timeout` value onto the end of array `c`.
2. **Unshift**: `object["c"].unshift(timeout)`
	* This test case shifts the `timeout` value to the beginning of array `c`.
3. **Set**: `object["c"] = [timeout]`
	* This test case sets array `c` to a new array containing only the `timeout` value.

**Library: Lodash**

The `unshift` and `push` tests use the Lodash library, which is not explicitly mentioned in the benchmark definition. However, upon closer inspection, we can see that the code uses `_`.lodash.unshift()` and `_._.push()`, indicating that Lodash is being used.

**Lodash Purpose**

Lodash is a popular JavaScript utility library that provides a wide range of functions for tasks such as array manipulation, string templating, and more. In this case, Lodash is being used to provide a concise way to perform the `unshift` and `push` operations on arrays.

**Pros and Cons**

Here are some pros and cons of each approach:

1. **Push**
	* Pros: Simple and efficient; well-supported by most JavaScript engines.
	* Cons: May not be as fast as other approaches due to its nature.
2. **Unshift**
	* Pros: Can be faster than `push` for certain use cases, especially when dealing with large arrays.
	* Cons: May have performance overhead due to the use of Lodash.
3. **Set**
	* Pros: Simple and efficient; can be faster than `push` or `unshift` in some cases.
	* Cons: May not be as widely supported by JavaScript engines.

**Other Alternatives**

If you were to rewrite these tests without using Lodash, you could use built-in array methods like:

1. `array.push()`
2. `array.unshift()`

However, keep in mind that the performance characteristics of these methods may vary depending on the specific use case and browser/engine being used.

**Special JavaScript Features or Syntax**

There are no special JavaScript features or syntax mentioned in this benchmark. However, if you were to add any experimental or proposed features, such as `Array.prototype.set()` (which is currently a proposal), it would likely be marked for discussion or testing on platforms like MeasureThat.net.

Related benchmarks:

test array setting value (version: 0)

Comparing performance of: push vs unshift vs set

Created: 3 years ago by: Guest

Jump to the latest result

push

unshift

set

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):