Benchmark: for vs foreach vs some

Script Preparation code:

var array = new Array(100);

Tests:

for
var arrayLength = array.length; for (var i = 0; i < arrayLength; i++) { array[i]; }
foreach
array.forEach(function(item, index) { return item; });
some
array.some(function(item, index) { return item === array[index]; });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
foreach
some

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36 OPR/52.0.2871.99

Browser/OS: Opera 52 on Linux

View result in a separate tab

Test name	Executions per second
for	75784.5 Ops/sec
foreach	2449016.2 Ops/sec
some	1174528.8 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

The provided JSON represents a benchmark test case that compares the performance of three different loop constructs: `for`, `foreach`, and `some`. The test aims to measure which approach is faster in terms of execution time.

**Loop Options Compared:**

1. **For Loop**: A traditional loop construct that uses a counter variable (`i`) to iterate over an array.
2. **Foreach Loop**: A loop construct that iterates over an array using the `forEach` method, which provides two arguments: the current element and its index.
3. **Some Loop**: A loop construct that tests if at least one element in the array meets a certain condition.

**Pros and Cons of Each Approach:**

1. **For Loop**:
	* Pros: Simple, straightforward, and easy to understand.
	* Cons: Can be slower than other approaches due to the overhead of incrementing the counter variable.
2. **Foreach Loop**:
	* Pros: More concise and expressive than traditional `for` loops, as it avoids explicit index management.
	* Cons: May incur higher overhead due to the need to call the callback function with two arguments (element and index).
3. **Some Loop**:
	* Pros: Can be more efficient than other approaches when only one element needs to meet a certain condition.
	* Cons: May be slower for arrays that do not have any matching elements, as it incurs additional overhead for checking the condition.

**Library Used:** None

The test does not use any external libraries or frameworks. The code is self-contained and relies solely on the built-in JavaScript features.

**Special JS Features/Syntax:** None mentioned

There are no special JavaScript features or syntax used in this benchmark. It's a straightforward comparison of three basic loop constructs.

**Other Alternatives:**

1. **While Loop**: An alternative to `for` loops that uses a conditional statement to control the iteration.
2. **Map(), Filter(), Reduce()**: These array methods can be used to iterate over arrays, but they are not explicitly looping constructs like `for`, `foreach`, or `some`.
3. **Async/await**: While not directly related to loop performance, async/await can affect performance by introducing asynchronous operations that may incur additional overhead.

In conclusion, this benchmark test case provides a simple and informative comparison of three basic loop constructs in JavaScript: `for`, `foreach`, and `some`. The results can help developers optimize their code for better performance.

Related benchmarks:

for vs foreach vs some (version: 0)

Compare loop performance

Comparing performance of: for vs foreach vs some

Created: 6 years ago by: Guest

Jump to the latest result

for

foreach

some

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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