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Chaining Push/Concat/Spread
(version: 0)
Comparing performance of:
concat vs push vs spread
Created:
4 years ago
by:
Guest
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Tests:
concat
var params = new Array(1000); let other = []; for (let x = 0; x < 100; ++x) { other = other.concat(params); }
push
var params = new Array(1000); let other = []; for (let x = 0; x < 100; ++x) { other.push(...params); }
spread
var params = new Array(1000); let other = []; for (let x = 0; x < 100; ++x) { other = [...other, ...params]; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
concat
push
spread
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 JSON and explain what is being tested, compared, and other considerations. **Benchmark Definition** The benchmark definition specifies three different approaches to test: 1. Chaining: `other = other.concat(params)` 2. Pushing: `other.push(...params)` 3. Spreading: `other = [...other, ...params]` These approaches are used to concatenate or merge two arrays: `params` and `other`. The number of elements in `params` is 1000. **Library Usage** None of the provided benchmark definitions use any external libraries. **Special JS Features/Syntax** The only special syntax used in these tests is array spreading (`...`) in the "Spread" test case. Array spreading allows creating a new array by taking all elements from an existing array and adding them to it. Let's analyze each approach: * **Chaining**: This approach uses the assignment operator (`=`) to concatenate `other` with `params`. The result is stored back in `other`. This method can be more efficient because it avoids creating a new array, but it may lead to performance issues if the arrays are large. * **Pushing**: This approach uses the `push()` method to add all elements from `params` to `other`. This creates a new array and copies the data. While this is more straightforward, it can be slower than chaining because of the overhead of creating a new array. * **Spreading**: This approach uses the spread operator (`...`) to create a new array by taking all elements from both `other` and `params`. This method is concise but may lead to performance issues if the arrays are very large. **Other Considerations** * The use of `concat()` and `push()` methods can be influenced by the browser's optimization techniques. * Chaining might be faster in some cases, while pushing might be faster in others. The spread operator can also be optimized or not optimized depending on the browser. * The performance difference between these approaches may vary depending on the JavaScript engine used (e.g., V8 in Chrome). **Alternatives** There are other ways to concatenate arrays in JavaScript: * Using `Array.prototype.reduce()` method: `other = other.reduce((acc, x) => acc.concat(x), params)` * Using a `for` loop and `push()` method: `for (let i = 0; i < params.length; i++) { other.push(params[i]); }` However, the spread operator (`...`) is generally considered the most concise and efficient way to create a new array by concatenating two arrays.
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