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testasdasdasd
(version: 0)
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
3 years ago
by:
Guest
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Tests:
Array.prototype.concat
const params = new Array(10000); const params2 = new Array(10000); const other = params2.concat(params);
spread operator
const params = new Array(10000); const params2 = new Array(10000); const other = [...params2, ...params];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Array.prototype.concat
spread operator
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 configuration and explain what's being tested. **Benchmark Definition** The benchmark definition is an empty object, which means that users can create their own custom benchmarks using a JavaScript script. The script preparation code and HTML preparation code fields are also empty, indicating that the benchmark doesn't require any specific setup or rendering before running. **Individual Test Cases** There are two test cases: 1. `Array.prototype.concat` * Benchmark Definition: `const params = new Array(10000);\r\nconst params2 = new Array(10000);\r\nconst other = params2.concat(params);` * Description: This benchmark tests the performance of the `concat` method on the `Array.prototype`. The test creates two arrays with 10,000 elements each and then concatenates them. The resulting array is assigned to a third variable named `other`. 2. `spread operator` * Benchmark Definition: `const params = new Array(10000);\r\nconst params2 = new Array(10000);\r\nconst other = [...params2, ...params];` * Description: This benchmark tests the performance of the spread operator (`...`) on two arrays with 10,000 elements each. The test uses the spread operator to concatenate the two arrays into a single array. **Options Compared** Both benchmarks compare the performance of different approaches for concatenating arrays: 1. `concat` method (Array.prototype) 2. Spread operator (`...`) **Pros and Cons of Each Approach** 1. `concat` method: * Pros: widely supported, easy to use * Cons: can be slower than the spread operator due to the overhead of creating a new array object 2. Spread operator (`...`): * Pros: modern, efficient, and concise * Cons: requires JavaScript 8+ support, not as widely adopted as the `concat` method **Library Usage** Neither benchmark uses any external libraries. **Special JS Features or Syntax** There are no special features or syntax used in these benchmarks. They rely on standard JavaScript features. **Other Alternatives** For array concatenation, other alternatives include: 1. `Array.prototype.push()`: pushes elements from one array to another. 2. `Array.prototype.concat()` with a callback function: pushes elements from one array to another and applies a callback function to each element. 3. Using `Set` or `Map` data structures instead of arrays for concatenation. Note that the spread operator is generally considered the most efficient and concise way to concatenate arrays in modern JavaScript.
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