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Spread vs push array
(version: 0)
Comparing performance of:
push spreader vs spread itself
Created:
4 years ago
by:
Guest
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Script Preparation code:
var f = [1,2,3] var l = [4,5]
Tests:
push spreader
f.push(...l)
spread itself
f = [...f, ...l]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
push spreader
spread itself
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain what's being tested in this benchmark. **Benchmark Overview** The benchmark compares two ways of adding elements to an array: using the `push` method with the spread operator (`...`) and using the spread operator on its own. **Options Compared** There are two main options being compared: 1. **`f.push(...l)`**: This option uses the spread operator (`...`) to add all elements from the `l` array to the end of the `f` array using the `push` method. 2. **`f = [...f, ...l]`**: This option creates a new array by concatenating the current `f` array with the spread operator applied to both `f` and `l`. **Pros and Cons** * **`f.push(...l)`**: + Pros: This method is more concise and readable. It avoids creating an intermediate array, which can be beneficial for large datasets. + Cons: In older browsers (e.g., Internet Explorer), the spread operator is not supported. Also, it may lead to slower performance due to the overhead of the `push` method. * **`f = [...f, ...l]`**: + Pros: This method creates a new array, which can be beneficial for large datasets as it avoids modifying the original array. It's also more explicit and easier to understand. + Cons: This method is less concise and may lead to slower performance due to the creation of an intermediate array. **Library Usage** There doesn't appear to be any specific library usage in this benchmark. However, modern JavaScript engines (like Firefox) support the spread operator, which is a part of the ECMAScript 2015 standard. **Special JS Feature or Syntax** The use of the spread operator (`...`) and template literals (`\r\nvar f = [1,2,3]\r\nvar l = [4,5]`) is specific to modern JavaScript engines. Older browsers may not support these features. **Other Alternatives** If `push` with spread operator or spread operator on its own isn't suitable for your use case, you could consider other methods: * Using the `concat` method: `f.concat(l)` * Creating a new array using the `Array.prototype.map` method: `[...l].map(x => f.push(x))` * Using a library like Lodash's `unionBy` function However, these alternatives may have performance implications and might not be as concise or readable as the options being compared in this benchmark.
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