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for vs for..of
(version: 0)
Compare loop performance
Comparing performance of:
for vs for ... of
Created:
2 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var array = new Array(100); var array2 = [];
Tests:
for
for (var i = 0; i < array.length; i++) { array2.push(array[i]); }
for ... of
for (var i of array) { array2.push(i); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
for
for ... of
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON data and explain what's being tested. **Benchmark Definition** The benchmark is designed to compare the performance of two different loop constructs in JavaScript: `for` loops and `for...of` loops. **Options Compared** Two options are being compared: 1. **Traditional `for` loops**: The first option uses a traditional `for` loop with an incrementing variable (`i`) to iterate over the array elements. 2. **`for...of` loops**: The second option uses a `for...of` loop, which is a newer syntax that allows iterating directly over arrays and other iterable objects without manual indexing. **Pros and Cons of Each Approach** * **Traditional `for` loops**: + Pros: Well-established, widely supported, and easy to understand. + Cons: Can be less efficient due to the need for manual indexing and incrementing. * **`for...of` loops**: + Pros: More concise, readable, and potentially faster (as shown in the benchmark results). + Cons: May not work as expected in certain edge cases or when working with non-iterable objects. **Library** In this case, there is no explicitly mentioned library being used. However, it's worth noting that `for...of` loops rely on the ES6 specification for their implementation. **Special JS Feature/Syntax** The benchmark uses a newer syntax (`for...of` loops) and takes advantage of the latest JavaScript features. **Benchmark Preparation Code and HTML Preparation Code** The provided script preparation code creates two arrays: `array` with 100 elements, and `array2`, which is an empty array. The HTML preparation code is null, indicating that no additional HTML-related setup is required for this benchmark. **Alternatives** Other alternatives to these loop constructs include: 1. **While loops**: While loops can be used in place of `for` loops, they require more manual effort and indexing. 2. **Array.prototype.forEach()**: The `forEach()` method can be used as an alternative to both traditional `for` loops and `for...of` loops, but it may not provide the same performance benefits. In summary, the benchmark is designed to compare the performance of two loop constructs in JavaScript: traditional `for` loops and `for...of` loops. The results suggest that `for...of` loops may be faster than traditional `for` loops, making them a more attractive choice for efficient array iteration.
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