Benchmark: for vs some - searching for element

Script Preparation code:

var data = []

for (let i = 0; i < 5000; ++i) data.push({ username: 'toto' })
data.push({ username: 'titi', checked: true, id: 'seen' })
for (let i = 0; i < 2500; ++i) data.push({ username: 'toto' })

Tests:

for
let seen; for (let i = 0; i < data.length; i++) { if (data[i].checked) { seen = data[i].id === "seen" ? "T" : "F"; break; } }
some
const seen = Array.from(data).some(el => el.checked && el.id === "seen") ? 'T' : 'F';

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
some

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's dive into the world of JavaScript microbenchmarks and explore what's being tested in this specific benchmark.

**Benchmark Definition**

The benchmark definition is a JSON object that describes two test cases: `for` and `some`. The script preparation code for both tests creates an array `data` with 7500 elements, consisting of objects with `username`, `checked`, and `id` properties. The purpose of this setup is to create a large dataset that can be searched through.

**Options Compared**

The two test cases differ in how they search for an element in the `data` array:

1. **`for` loop**: The first test case uses a traditional `for` loop to iterate over the array and check each element's `checked` property. If found, it sets the variable `seen` to either `"T"` or `"F"`.
2. **`some()` method**: The second test case uses the `Array.prototype.some()` method to search for an element that meets the condition (`el.checked && el.id === "seen"`). If such an element is found, the expression evaluates to `true`, and the variable `seen` is set accordingly.

**Pros and Cons of Each Approach**

1. **`for` loop**:
	* Pros: More control over the iteration process, can be more efficient for small arrays.
	* Cons: Can be slower for large arrays due to the overhead of the loop and condition checks.
2. **`some()` method**:
	* Pros: Faster and more concise, especially for large arrays, since it uses a single pass through the array.
	* Cons: Less control over the iteration process and can be less efficient for small arrays.

**Library Usage**

The `Array.prototype.some()` method is part of the JavaScript standard library. It's a built-in function that provides a convenient way to search for an element in an array that meets a condition.

**Special JS Feature or Syntax (None)**

There are no special features or syntaxes used in this benchmark.

**Other Considerations**

When choosing between these two approaches, consider the size of your dataset and the performance requirements of your application. For large datasets, the `some()` method is likely to be faster and more efficient. However, for small datasets, a traditional `for` loop might provide better control and readability.

If you need even more flexibility or customization, you may want to explore alternative approaches, such as:

1. **Regular expressions**: Using regex can provide a concise way to search for patterns in the array.
2. **Array methods**: Other array methods like `find()` or `filter()` might be suitable alternatives depending on your specific use case.

Keep in mind that these alternatives may come with their own trade-offs in terms of performance, readability, and complexity.

I hope this explanation helps you understand what's being tested in this benchmark!

Related benchmarks:

for vs some - searching for element (version: 0)

Comparing performance of: for vs some

Created: 5 years ago by: Guest

Jump to the latest result

for

some

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):