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EGO concat vs spread Small Array
(version: 0)
Comparing performance of:
concat vs spread
Created:
4 years ago
by:
Registered User
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Script Preparation code:
var base = ['r', 's', 't'];
Tests:
concat
var toMerge = ['a', 'b', 'c', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q']; var merged = base.concat(toMerge);
spread
var toMerge = ['a', 'b', 'c', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q']; var merged = [...base, ...toMerge];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
concat
spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks. The provided JSON represents a benchmark test on MeasureThat.net, which aims to compare two approaches: concatenating arrays using the `concat()` method and spreading arrays using the spread operator (`...`). **Benchmark Definition** In this case, we have two individual test cases: 1. `concat`: This test case uses the `concat()` method to merge two arrays: `base` and `toMerge`. The `base` array is initialized with three elements: `['r', 's', 't']`. 2. `spread`: Similar to the previous test case, but this time we use the spread operator (`...`) to merge the same two arrays. **Options Compared** We are comparing two options: 1. **Concatenation using `concat()`**: This method creates a new array and copies elements from both input arrays into it. 2. **Spreading arrays using `...`**: This method creates a new array by copying elements from both input arrays into an array initializer. **Pros and Cons** * **Concatenation using `concat()`**: + Pros: Widely supported, easy to read and understand. + Cons: Creates a new array, which can lead to performance overhead. * **Spreading arrays using `...`**: + Pros: More concise, modern syntax, and faster than `concat()`. + Cons: Requires support for the spread operator (introduced in ECMAScript 2015), might be less readable for some developers. **Library Used** None. **Special JS Features/Syntax** The test case uses the spread operator (`...`), which is a modern JavaScript feature introduced in ECMAScript 2015. The `concat()` method, on the other hand, is a built-in function that has been around since JavaScript's inception. **Other Considerations** When choosing between these two approaches, consider the following factors: * Performance: Spreading arrays using `...` might be faster due to its optimized implementation. * Readability: If code readability is important, concatenation using `concat()` might be a better choice. * Compatibility: Ensure that your target browsers or environments support the spread operator. **Alternatives** Other alternatives for merging arrays include: 1. **Using `slice()` and `push()`**: You can use `slice()` to create a shallow copy of an array and then push elements from another array into it using `push()`. 2. **Using `Array.prototype.push.apply()`**: This method applies the `push()` method to multiple arguments. 3. **Using a loop**: You can manually iterate over both arrays and add elements to a new array. Keep in mind that these alternatives might have different performance characteristics compared to using `concat()` or spreading arrays with `...`.
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