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Test of unshift methods
(version: 0)
Comparing performance of:
Test 1 vs Test 2 vs Test 3
Created:
4 years ago
by:
Registered User
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Script Preparation code:
var array = [1,2,3];
Tests:
Test 1
array.unshift(0);
Test 2
array = ([0]).concat(array)
Test 3
array = [0, ...array]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Test 1
Test 2
Test 3
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview of the Benchmark** The provided JSON represents a JavaScript microbenchmark created using MeasureThat.net. The benchmark tests the performance of three different approaches to add an element to the beginning of an array in JavaScript. **Approaches Compared** 1. **Unshift Method (`array.unshift(0)`)**: This approach uses the built-in `unshift()` method to add an element to the beginning of the array. 2. **Concatenation with Array Creation (`array = ([0]).concat(array)`)**: This approach creates a new array by concatenating an initial array with the original array using the spread operator (`[...array]`). 3. **Spread Operator with Array Creation (`array = [0, ...array]`)**: This approach uses the spread operator to create a new array and add it to the beginning of the original array. **Pros and Cons of Each Approach** 1. **Unshift Method**: * Pros: Efficient and direct access to the `unshift()` method. * Cons: May not be optimized for performance, especially in older browsers or with large arrays. 2. **Concatenation with Array Creation**: * Pros: Works well with most modern browsers and can handle large arrays efficiently. * Cons: Creates a new array object, which may lead to memory allocation issues for very large arrays. 3. **Spread Operator with Array Creation**: * Pros: Convenient and efficient way to create a new array while adding elements. * Cons: May not be supported in older browsers or versions of JavaScript. **Library Used (if any)** None explicitly mentioned in the provided JSON, but it's likely that the benchmark uses a library like MeasureThat.net's own implementation or a custom setup for performance testing. **Special JS Features/Syntax** The benchmark uses ES6 spread operator (`[...array]`) and template literals (``). However, it's worth noting that these features are widely supported in modern browsers and versions of JavaScript. **Other Alternatives** If you're interested in exploring alternative approaches or comparing the performance of other methods (e.g., using `Array.prototype.push()` with a callback), you can consider modifying the benchmark JSON to include additional test cases. For example: * Using `push()` with a callback: `array.push(0)` * Using `splice()` to insert an element at the beginning of the array: `array.splice(0, 0, 0)` Keep in mind that these alternatives may have different performance characteristics and should be tested separately to ensure accurate results.
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