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for vs foreach (lastest)
(version: 0)
Compare loop performance
Comparing performance of:
for vs foreach
Created:
2 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var array = new Array(10000);
Tests:
for
for (var i = 0; i < array.length; i++) { array[i]; }
foreach
array.forEach(function(i) { array[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
foreach
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36
Browser/OS:
Chrome 124 on Windows
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<iframe src="https://measurethat.net/Embed?id=521616" width="100%" height="500px"></iframe>
foreach
117K/s
for
1K/s
View exact numbers
Test name
Executions per second
✓
foreach
117,028 Ops/sec
for
1,167 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. The provided benchmark tests two approaches to iterate over an array: the traditional `for` loop and the `forEach` method. The test aims to compare the performance of these two methods. **What is being tested?** In this case, we're testing the execution speed of the following code snippets: * A traditional `for` loop that iterates over the elements of an array using a manual index (`i`) and accesses each element at `array[i]`. * The `forEach` method, which is called on the array object, executing a callback function for each element in the array. **Options compared** The benchmark compares the performance of these two approaches: 1. **Traditional `for` loop**: This approach uses a manual index (`i`) to iterate over the elements of the array. 2. **`forEach` method**: This approach uses the `forEach` method, which is a part of the Array prototype, to iterate over the elements of the array. **Pros and Cons** Here's a brief overview of the pros and cons of each approach: * **Traditional `for` loop**: + Pros: Direct control over the iteration process, can be optimized for specific use cases. + Cons: More verbose code, requires manual index management. * **`forEach` method**: + Pros: Concise and expressive code, automatic index management. + Cons: May incur overhead due to function invocation and argument passing. In general, the `forEach` method is a good choice when you need to perform an operation on each element of an array without requiring direct access to the elements (e.g., modifying the array while iterating). However, for cases where manual control over the iteration process is necessary, the traditional `for` loop might be a better fit. **Library and purpose** In this benchmark, the `forEach` method uses the built-in Array prototype in JavaScript. This method was introduced in ECMAScript 5 (ES5) as part of the standard library. **Special JS feature or syntax** There are no special JavaScript features or syntax used in these benchmarks. The code snippets are straightforward and do not rely on any advanced or experimental features. **Other alternatives** If you're looking for alternative approaches to iterate over an array, consider: * **`map()` and `reduce()` methods**: These methods are also part of the Array prototype and can be used to perform operations on each element of an array. * **`for...of` loop**: Introduced in ECMAScript 2015 (ES6), this loop is designed specifically for iterating over arrays and other iterable objects. * **Custom iteration functions**: You can create custom iteration functions using recursion, iterators, or generators. Keep in mind that the choice of iteration approach depends on your specific use case, performance requirements, and personal coding style.
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