Benchmark: forEach variants

Tests:

1
let _array = Array.from({length: 100000}, (v, i) => 'body'); _array.forEach(i => { test(i); function test(p) { document.querySelector(p); } });
2
let _array = Array.from({length: 100000}, (v, i) => 'body'); function test(p) { document.querySelector(p); } _array.forEach(i => { test(i); });
3
let _array = Array.from({length: 100000}, (v, i) => 'body'); _array.forEach(i => { let test = function(p) { document.querySelector(p); } test(i); });
4
let _array = Array.from({length: 100000}, (v, i) => 'body'); _array.forEach(i => { function test(p) { document.querySelector(p); } test(i); });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2
3
4

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0

Browser/OS: Firefox 75 on Windows

View result in a separate tab

Test name	Executions per second
1	33.9 Ops/sec
2	31.4 Ops/sec
3	33.5 Ops/sec
4	33.9 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring JavaScript performance is crucial for optimizing and improving the overall efficiency of web applications.

**Benchmark Overview**

The provided benchmark measures the performance of different approaches when using `forEach` loops to execute a function on an array of strings containing HTML elements. The test cases compare various configurations, including:

1. Function declaration inside the loop (`test(i);`)
2. Function definition before the loop (`let test = function(p) { ... }`)

**Options Compared**

The benchmark compares two primary options:

A) **Inline function declaration**: `function test(p) { document.querySelector(p); }`
B) **Pre-declared function**: `let _array = Array.from({length: 100000}, (v, i) => 'body'); function test(p) { document.querySelector(p); }`

**Pros and Cons**

A) **Inline Function Declaration**

Pros:

* No additional memory allocation for the function object
* May lead to faster execution due to fewer overheads

Cons:

* Code readability and maintainability may suffer due to inline declaration
* Error handling and debugging can be more challenging

B) **Pre-Declared Function**

Pros:

* Better code organization and readability
* Easier error handling and debugging
* Can be reused in other parts of the codebase

Cons:

* Additional memory allocation for the function object
* May lead to slower execution due to overheads associated with function creation

**Library Usage (none)**

There are no libraries used in this benchmark.

**Special JavaScript Features (none)**

No special JavaScript features or syntax are used in this benchmark.

**Other Alternatives**

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

1. **Use a loop instead of forEach**: `Array.prototype.forEach.call(_array, function(test(p) { document.querySelector(p); });`
2. **Optimize the querySelector function**: Use `document.querySelector` with a specific selector to reduce overhead.
3. **Minimize DOM queries**: Avoid unnecessary DOM queries by caching or memoizing results.

**In conclusion**, this benchmark highlights the importance of considering code organization, readability, and maintainability when optimizing JavaScript performance. The pre-declared function approach may lead to better performance in terms of execution speed, but at the cost of additional memory allocation.

Related benchmarks:

forEach variants (version: 0)

Comparing performance of: 1 vs 2 vs 3 vs 4

Created: 4 years ago by: Guest

Jump to the latest result

1

2

3

4

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):