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forEach variants
(version: 0)
Comparing performance of:
1 vs 2 vs 3 vs 4
Created:
6 years ago
by:
Guest
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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); });
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Suite status:
<idle, ready to run>
Run tests (4)
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Result
1
2
3
4
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
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.
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