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Shift loop vs unrolled
(version: 0)
Comparing performance of:
Shift loop vs Unrolled Loop
Created:
9 years ago
by:
Guest
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Tests:
Shift loop
const arr = []; const ARRAY_SIZE = 5000; for (let i = 0; i < ARRAY_SIZE; i++) { arr.push(i); } while(arr.length) { let index = arr.shift(); index++; }
Unrolled Loop
arr = []; const ARRAY_SIZE = 5000; for (let i = 0; i < ARRAY_SIZE; i++) { arr.push(i); } const arrSize = arr.length; for (let i = 0; i < arrSize; i++) { let index = arr[i]; index++; } arr = [];
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Suite status:
<idle, ready to run>
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Test case name
Result
Shift loop
Unrolled Loop
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, compared, and the pros and cons of each approach. **Benchmark Overview** The benchmark compares two approaches to shifting elements from an array: 1. **Shift Loop**: The original implementation using a traditional `for` loop to iterate through the array and shift elements. 2. **Unrolled Loop**: An optimized version that uses a single iteration to access multiple elements in the array, reducing the number of iterations. **What's Being Tested** The benchmark measures the execution time (in executions per second) for each approach on different devices (Chrome Mobile 91) running various operating systems (Android). **Options Compared** The two options being compared are: 1. **Shift Loop**: A traditional implementation using a `for` loop to iterate through the array and shift elements. 2. **Unrolled Loop**: An optimized version that uses a single iteration to access multiple elements in the array. **Pros and Cons of Each Approach** **Shift Loop** Pros: * Easy to understand and implement * Can be modified for specific use cases Cons: * May have slower execution times due to the overhead of iterating through the array * Can be less efficient due to unnecessary computations **Unrolled Loop** Pros: * Can potentially reduce execution time by minimizing iterations * Optimized for performance-critical loops Cons: * More complex and harder to understand, especially for developers without experience with array manipulation * May not be suitable for all use cases or data structures **Library Used** None explicitly mentioned in the benchmark definition. However, it's likely that the `push` method used in the implementations is part of the JavaScript Array prototype. **Special JS Feature/Syntax** There is no special JavaScript feature or syntax being tested in this benchmark. Both approaches rely on standard JavaScript features like arrays and loops. **Other Alternatives** If you're looking for alternative approaches to shifting elements from an array, some options include: 1. Using `splice` with a negative index to shift elements. 2. Utilizing `Array.prototype.indexOf` to find the first occurrence of a certain element and then using slicing to extract the desired elements. 3. Employing a custom implementation using indexing arithmetic. Keep in mind that each approach has its trade-offs, and the best solution depends on the specific use case, performance requirements, and personal preference. If you'd like to experiment with different approaches or optimize the unrolled loop, MeasureThat.net provides an excellent platform for testing and benchmarking JavaScript code.
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