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Best practise for loop, with more options
(version: 0)
Comparing performance of:
best practice vs normal vs best practice with plus plus reversed vs normal with plus plus reversed vs backwards vs backwards minus minus reversed
Created:
6 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var names = ['George','Ringo','Paul','John','George','Ringo','Paul','John','George','Ringo','Paul','John','George','Ringo','Paul','John','George','Ringo','Paul','John','George','Ringo','Paul','John']; var total = 0;
Tests:
best practice
for(var i=0,j=names.length;i<j;i++){ total++ }
normal
for(var i=0; i<names.length;i++){ total++; }
best practice with plus plus reversed
for(var i=0,j=names.length;i<j;i++){ total++ }
normal with plus plus reversed
for(var i=0; i<names.length;++i){ total++; }
backwards
for(var i=names.length-1;i>=0;i--){ total++ }
backwards minus minus reversed
for(var i=names.length-1;i>=0;--i){ total++ }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (6)
Previous results
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Test case name
Result
best practice
normal
best practice with plus plus reversed
normal with plus plus reversed
backwards
backwards minus minus reversed
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 dive into the world of JavaScript microbenchmarks on MeasureThat.net. The benchmark you provided tests different approaches for iterating over an array in a `for` loop. The goal is to determine which method is most efficient. **Benchmark Definitions:** 1. **Best Practice:** `for(var i=0,j=names.length;i<j;i++){\r\n total++\r\n}` 2. **Normal:** `for(var i=0; i<names.length;i++){\r\n total++;\r\n}` 3. **Best Practice with Plus Plus Reversed:** `for(var i=names.length-1;i>=0;++i){\r\n total++\r\n}` 4. **Normal with Plus Plus Reversed:** `for(var i=names.length-1;i>=0;--i){\r\n total++\r\n}` 5. **Backwards:** `for(var i=names.length-1;i>=0;i--){\r\n total++\r\n}` 6. **Backwards Minus Minus Reversed:** `for(var i=names.length-1;i>=0;--i){\r\n total++\r\n}` **Options Compared:** The benchmark compares the performance of six different approaches: * Best Practice with explicit increment (`i++`) * Normal with explicit increment (`i++`) * Best Practice with implicit increment (`i--;`) and plus plus reversed * Normal with implicit increment (`--i`) and plus plus reversed * Backwards iteration using decrement (`--i`) * Backwards iteration using minus minus reversal (`--i`) **Pros and Cons:** 1. **Best Practice:** This approach is generally considered best practice for iterating over arrays in JavaScript. It avoids the issues with implicit increment and plus plus reversal. 2. **Normal:** This approach is simple and easy to read, but it can lead to problems if not used carefully (e.g., when working with array indices). 3. **Best Practice with Plus Plus Reversed:** While this approach may seem similar to the Best Practice method, using implicit increment (`--i`) can lead to issues with performance and code readability. 4. **Normal with Plus Plus Reversed:** Similar to the previous point, using plus plus reversal in a `for` loop can be problematic and lead to unexpected behavior. 5. **Backwards:** Iterating over an array in reverse order can be useful in certain situations, but it may not always be the most efficient approach. **Library/Feature Usage:** None of the benchmark definitions explicitly use any JavaScript libraries or features beyond basic `for` loops. **Special JS Features/Syntax:** No special JavaScript features or syntax are used in these benchmark definitions. The focus is solely on iterating over an array using a `for` loop. **Other Alternatives:** If you're interested in exploring other iteration methods, here are a few alternatives: * **While Loop:** Instead of using a `for` loop, you can use a `while` loop to iterate over the array. This approach can be more flexible and easier to read in certain situations. * **Array.forEach():** JavaScript provides an array method called `forEach()` that allows you to iterate over arrays without explicit loops. This approach is often considered more concise and readable than traditional `for` loops. In conclusion, this benchmark helps determine which iteration method (Best Practice or Normal) is most efficient in JavaScript, while also exploring the implications of using plus plus reversal and implicit increment.
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