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ForOfFor
(version: 0)
Comparing performance of:
for of vs for
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var things = [...Array(100)].map((_, i) => 'k'+i);
Tests:
for of
let r1 = ''; for (const thing of things) { r1 += thing; }
for
let r2 = ''; for (let i = 0, length = things.length; i < length; ++i) { r2 += things[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 of
for
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided JSON for MeasureThat.net and explain what's being tested, compared options, pros and cons, and other considerations. **Benchmark Definition** The benchmark definition represents a JavaScript microbenchmark. It provides information about the benchmark: * `Name`: The name of the benchmark, "ForOfFor". * `Description`: An empty string, indicating no description is provided. * `Script Preparation Code`: A code snippet that prepares the environment for the benchmark. In this case, it creates an array of 100 strings using the `Array` constructor and the `map()` method, then assigns each string to a variable `thing`. * `Html Preparation Code`: An empty string, indicating no HTML preparation is needed. **Individual Test Cases** Two test cases are defined: 1. **"for of"`**: This test case executes the following code: ```javascript let r1 = ''; for (const thing of things) { r1 += thing; } ``` This code uses a `for...of` loop to iterate over the `things` array and concatenates each string to `r1`. 2. **"for"`**: This test case executes the following code: ```javascript let r2 = ''; for (let i = 0, length = things.length; i < length; ++i) { r2 += things[i]; } ``` This code uses a traditional `for` loop with an index variable `i` to iterate over the `things` array and concatenates each string to `r2`. **Comparison of Options** The benchmark compares two approaches: 1. **`for...of`**: This approach is often preferred for its simplicity, readability, and performance advantages over traditional `for` loops. 2. **Traditional `for` loop**: This approach can be more complex and verbose than `for...of`, but it provides fine-grained control over the iteration process. **Pros and Cons** **`for...of`**: * Pros: + Simpler syntax + Performance advantages due to optimized iterator implementation + Easier to read and maintain * Cons: + Limited control over iteration (e.g., indexing) **Traditional `for` loop**: * Pros: + Fine-grained control over iteration + Can be more efficient for certain use cases * Cons: + Verbose syntax + More complex to read and maintain **Other Considerations** * The `for...of` loop is generally preferred due to its performance advantages, but traditional `for` loops are still valid and may be necessary in specific situations. * The benchmark's results show that the `for...of` loop outperforms the traditional `for` loop, which aligns with general expectations. * MeasureThat.net aims to provide a fair comparison of different JavaScript approaches, allowing developers to choose the best option for their use cases. **Libraries and Special Features** No libraries are explicitly mentioned in the provided benchmark definition. However, the `Array.prototype.map()` method is used to create the array of strings, which is a part of the JavaScript standard library. **Special JS Feature or Syntax** The `for...of` loop syntax is a modern feature introduced in ECMAScript 2015 (ES6). It's designed for iterating over arrays and other iterable objects, providing a more concise and readable way to write loops.
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