Benchmark: for loop vs Array.some vs for of v2

Script Preparation code:

var array = Array.from(Array(1000), (_, i) => i);

Tests:

for
var result = false; for (let i = 0; i < array.length; i++) { if (array[i] > 500) { result = true; break; } }
some
let result = array.some(item => item > 500);
for of
let result = false; for (const item of array) { if (item > 500) { result = true; break; } }
for-2
var result = false; for (let i = 0, j = array.length; i < j; i++) { if (array[i] > 500) { result = true; break; } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
some
for of
for-2

Fastest: N/A

Slowest: N/A

Latest run results:

No previous 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!

**Benchmark Definition**

The benchmark is defined by the JSON object:
```json
{
  "Name": "for loop vs Array.some vs for of v2",
  "Description": "Compare loop performance",
  "Script Preparation Code": "var array = Array.from(Array(1000), (_, i) => i);",
  "Html Preparation Code": null
}
```
This benchmark compares the performance of three different looping constructs:

1. Traditional `for` loop
2. `Array.some()` method
3. For-of loop (introduced in ECMAScript 2015)

**Options Compared**

The benchmark compares the execution time of these three options for a specific use case: finding the first element in an array that satisfies a condition.

**Pros and Cons**

* **Traditional `for` Loop**
	+ Pros:
		- Wide support across older browsers and environments
	+ Cons:
		- Can be less efficient than other options due to manual index management
		- More prone to errors due to the need for manual indexing
* **Array.some() Method**
	+ Pros:
		- Concise and readable syntax
		- Built-in method with built-in support for iteration
	+ Cons:
		- May not be as efficient as traditional loops, especially for large arrays
		- Can lead to performance issues if used incorrectly (e.g., passing a function that returns true too frequently)
* **For-of Loop**
	+ Pros:
		- Modern and concise syntax
		- Less prone to errors compared to traditional `for` loops
	+ Cons:
		- Limited support across older browsers and environments (requires ECMAScript 2015 or later)
		- May not be as efficient as traditional loops for very large arrays

**Libraries Used**

There is no explicit library mentioned in the benchmark definition. However, it's likely that the `Array.from()` method is used to create a new array from an existing one, which is a built-in JavaScript method.

**Special JS Features or Syntax**

The benchmark uses the For-of loop (introduced in ECMAScript 2015) and the Array.some() method, both of which are modern syntax features. The traditional `for` loop is also used, but it's not considered special syntax.

**Other Considerations**

When writing microbenchmarks like this one, it's essential to consider factors such as:

* **Input size**: How does the performance change with larger or smaller input sizes?
* **Browser support**: What are the supported browsers and versions for each option?
* **JavaScript engine optimizations**: Are there any specific optimizations that can be applied to improve performance?
* **Test environment**: Is the test environment representative of real-world usage?

**Alternatives**

If you want to create a similar benchmark, you may consider using other looping constructs or methods, such as:

* `Array.reduce()`
* `forEach()`
* Custom loops with manual indexing

Keep in mind that each option has its own trade-offs and considerations. It's essential to choose the right approach for your specific use case and performance requirements.

Related benchmarks:

for loop vs Array.some vs for of v2 (version: 0)

Compare loop performance

Comparing performance of: for vs some vs for of vs for-2

Created: 5 years ago by: Guest

Jump to the latest result

for

some

for of

for-2

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):