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concat(spreadOp) vs flat()
(version: 0)
Compare the Array.flat() to concat() + spread operator
Comparing performance of:
reduce + Array.prototype.concat vs Array.prototype.flat
Created:
5 years ago
by:
Guest
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Tests:
reduce + Array.prototype.concat
var params = [[ 1, 2 ], [ "hello", true, 7 ]]; var other = [].concat(...params);
Array.prototype.flat
var params = [[1, 2, params], [ "hello", true, 7 ]]; var other = params.flat();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
reduce + Array.prototype.concat
Array.prototype.flat
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 the provided JSON. **Benchmark Definition** The benchmark is designed to compare two approaches for concatenating arrays: 1. `Array.prototype.concat() + spread operator` (denoted by the spread operator `...`) 2. `Array.prototype.flat()` (introduced in ECMAScript 2019) **Options Compared** The benchmark tests the performance of these two approaches on a specific use case: reducing an array of arrays using `Array.prototype.reduce()`, which requires concatenating intermediate results. **Pros and Cons** 1. **Array.prototype.concat() + spread operator**: This approach is widely supported by older browsers that don't have native support for `flat()`. However, it may be slower than `flat()` since it involves additional overhead from concatenating arrays. 2. **Array.prototype.flat()**: This approach is a more modern and efficient way to flatten arrays. It's also more concise and easier to read, making it a better choice for new codebases. However, its performance may vary depending on the browser support. **Library Usage** There are no specific libraries used in this benchmark. **Special JS Features or Syntax** The benchmark uses ES6+ features like: * Spread operator (`...`) * ECMAScript 2019 (ES9) feature: `Array.prototype.flat()` These features are widely supported by modern browsers, including Chrome 87. **Other Considerations** The benchmark is designed to provide a fair comparison between the two approaches. However, other factors that might affect performance, such as array size and shape, are not taken into account. Some alternatives to consider: * Using `Array.prototype.reduce()` with a custom flattening function instead of concatenating arrays. * Using a third-party library like Lodash or Underscore.js for more advanced array manipulation. * Optimizing the benchmark for specific use cases or performance-critical parts of the codebase.
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