Benchmark: Array.some vs. for..of + Break

Script Preparation code:

var hasZero = [];
var withoutZero = [];
for (var i = 0; i < 10000; i++) {
  hasZero.push(Math.floor(Math.random() * 1000));
  withoutZero.push(Math.floor(Math.random() * 1000) + 1)
}

Tests:

Array.some
var tempResult = !!Math.round(Math.random()) ? hasZero.some(v => v === 0) : withoutZero.some(v => v === 0);
for..of + break
var found = false; for (var element of Math.round(Math.random()) ? hasZero : withoutZero) { if (element === 0) { found = true; break; } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.some
for..of + break

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**Benchmark Overview**

The provided JSON represents a benchmark that compares two approaches for checking if an array contains at least one zero element: `Array.some()` and a custom implementation using a `for..of` loop with a `break` statement.

**Test Cases**

There are two test cases:

1. **"Array.some"`**: This test case uses the built-in `Array.some()` method to check if the `hasZero` array contains at least one zero element.
2. **"for..of + break"`**: This test case uses a custom implementation that iterates over the `withoutZero` array using a `for...of` loop and breaks out of the loop as soon as it finds a zero element.

**Options Compared**

The two options compared are:

* **`Array.some()`**: A built-in method in JavaScript that returns a boolean indicating whether at least one element in an array satisfies a provided condition.
* **Custom `for..of + break` implementation**: A custom loop that iterates over the array and breaks out of the loop as soon as it finds a zero element.

**Pros and Cons**

### Array.some()

Pros:

* **Concise**: The code is short and easy to read.
* **Standardized**: It's a built-in method, so users are familiar with its syntax.
* **Efficient**: It uses a optimized implementation under the hood.

Cons:

* **Less control**: Users have limited control over the iteration process.
* **Potential performance issues**: Depending on the array size and content, `Array.some()` might be slower than the custom implementation.

### Custom for..of + break implementation

Pros:

* **Control**: Users have more control over the iteration process, including when to break out of the loop.
* **Performance**: For small arrays or specific use cases, this implementation can be faster due to the ability to exit early.
* **Educational value**: This implementation helps users understand how loops work in JavaScript.

Cons:

* **Verbose**: The code is longer and more complex than the `Array.some()` version.
* **Less standardized**: Users might not be familiar with this syntax, which could lead to confusion or performance issues if used elsewhere.

**Other Considerations**

* **Type safety**: Both implementations use `===` for comparison, ensuring type safety.
* **Readability**: The custom implementation uses a clear and concise variable name (`found`) to indicate the loop's purpose.
* **Reusability**: The custom implementation can be reused in other contexts where iteration with early exit is necessary.

**Library Used**

None of the provided implementations rely on external libraries. However, if we were to extend this benchmark to include more complex use cases or additional libraries, we might see the introduction of libraries like `lodash` (e.g., `lodash.some()`) or ` Ramda` (e.g., `R.some()`).

**Special JS Features/Syntax**

None of the provided implementations explicitly utilize any special JavaScript features or syntax. However, the custom implementation does demonstrate basic understanding of loops and conditionals.

**Alternatives**

If you're interested in exploring alternative approaches for this benchmark, consider the following:

* **`Array.prototype.includes()`**: Another built-in method that can be used to check if an array contains a specific value.
* **`for...in` loop**: An alternative iteration approach that uses property names as indices instead of traditional array indexing.
* **`Node.js-specific features`**: If you're targeting Node.js, consider using `Array.prototype.some()` with `Node.js 14+` or exploring other Node.js-specific optimizations.

Feel free to ask if you have any further questions or need clarification on any of these points!

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36

Browser/OS: Chrome 86 on Linux

View result in a separate tab

Test name	Executions per second
Array.some	20125.1 Ops/sec
for..of + break	78425.1 Ops/sec

Related benchmarks:

Array.some vs. for..of + Break (version: 0)

Comparing performance of: Array.some vs for..of + break

Created: 4 years ago by: Guest

Jump to the latest result

Array.some

for..of + break

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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