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Javascript unshift
(version: 0)
Comparing performance of:
Unshift vs Spread
Created:
5 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var testArray = [4,5,6,6,2,3,4,56,6,2,3,4,5,65,6,2,3,423,4,5,6,6,2,3,4,56,6,2,3,4,5,65,6,2,3,423,4,5,6,6,2,3,4,56,6,2,3,4,5,65,6,2,3,423]
Tests:
Unshift
testArray.unshift(5)
Spread
testArray = [5, ...testArray]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Unshift
Spread
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 definition is an object that provides metadata about the test case. In this case, there are two test cases: 1. `Javascript unshift` * Description: None * Script Preparation Code: A JavaScript array `testArray` containing 43 elements. 2. Two individual test cases: * "Unshift" + Benchmark Definition: `testArray.unshift(5)` * "Spread" + Benchmark Definition: `testArray = [5, ...testArray]` **Options Compared** The two options being compared are: 1. Using the `unshift()` method to add an element to the beginning of the array. 2. Using the spread operator (`...`) to create a new array with the original elements followed by the new element. **Pros and Cons** **Unshift() Method:** Pros: * More intuitive for adding an element to the beginning of the array. * Can be faster if the array is large, as it only needs to update the internal pointer. Cons: * May not be optimized for small arrays or arrays with a single element. * May have performance implications due to the need to update the internal pointer. **Spread Operator:** Pros: * More concise and readable for creating new arrays. * Can be faster for small arrays or arrays with a single element, as it only needs to create a new array reference. Cons: * May not be optimized for large arrays, as it creates a new array object. * May have performance implications due to the need to create a new array object. **Other Considerations** The test cases also consider other factors, such as: * The device platform (Desktop/Linux) and operating system (Linux). * The browser version (Firefox 93). These factors are likely included in the benchmarking process to ensure that the results are representative of real-world usage scenarios. **Library and Purpose** There is no library mentioned in the provided data. However, it's worth noting that the `unshift()` method is a built-in JavaScript method, while the spread operator (`...`) is also a built-in feature introduced in ECMAScript 2015 (ES6). **Special JS Feature or Syntax** The use of the spread operator (`...`) is an example of a new syntax introduced in ES6. This syntax allows for more concise and expressive way to create new arrays. Overall, the benchmarking process aims to compare the performance of two common array manipulation techniques: `unshift()` and the spread operator. The results can provide insights into the efficiency and effectiveness of these approaches in different JavaScript engines and environments.
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