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Custom flat vs Array.flat (Array.flat wins)
(version: 0)
Comparing performance of:
Array.flat vs deepFlat
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var theData1 = ['foo', ['bar', ['baz', ['qux', ['quux', ['corge', ['grault', ['garply', ['waldo', ['fred', ['plugh', ['xyzzy', ['thud']]]]]]]]]]]]] var theData2 = ['foo', ['bar', ['baz', ['qux', ['quux', ['corge', ['grault', ['garply', ['waldo', ['fred', ['plugh', ['xyzzy', ['thud']]]]]]]]]]]]] function deepFlat (children, target) { target = target == null ? [] : target for (let i = 0; i < children.length; i++) { const child = children[i] if (Array.isArray(child)) { deepFlat(child, target) } else { target.push(child) } } return target }
Tests:
Array.flat
theData1.flat(Infinity);
deepFlat
deepFlat(theData2)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Array.flat
deepFlat
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview** MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON represents two benchmark test cases: one for comparing `Array.flat` with a custom implementation (`deepFlat`) and another for measuring the execution time of each function. **Benchmark Definition** The first benchmark compares the performance of `Array.flat` with an arbitrary depth (represented by `Infinity`) against a custom implementation, `deepFlat`. The purpose of this test is to determine which approach is faster for flattening arrays with nested elements. **Options Compared** Two options are compared: 1. **Array.flat**: A built-in JavaScript method that returns a new array with the specified number of nested levels flattened. 2. **deepFlat**: A custom implementation written in JavaScript, designed to flatten arrays recursively. **Pros and Cons of Each Approach** **Array.flat:** Pros: * Native implementation, optimized for performance * Less code to write and maintain * Typically faster due to its native nature Cons: * Limited control over the flattening process (e.g., handling circular references) * May not be suitable for very large or deeply nested arrays **deepFlat:** Pros: * Flexibility to customize the flattening logic (e.g., handling circular references) * Suitable for large or deeply nested arrays * Allows for additional optimization techniques Cons: * More code to write and maintain * Potential performance overhead due to recursion and explicit loop control * May not be as fast as `Array.flat` for shallow arrays **Library Usage** The custom implementation, `deepFlat`, uses a simple recursive approach to flatten the array. It takes two parameters: `children` (the array to flatten) and `target` (the resulting flattened array). The function iterates through each element of `children`, checking if it's an array. If so, it recursively calls itself with the nested array as the new `children`. Otherwise, it pushes the element onto the `target` array. **Special JS Features or Syntax** None are explicitly mentioned in this benchmark definition. However, the use of `Infinity` to represent an arbitrary depth and the recursive approach used in `deepFlat` might be considered advanced JavaScript concepts. **Alternatives** For flattening arrays with nested elements, other alternatives include: 1. **Lodash.flatten()**: A popular utility library function that provides a more flexible and expressive way to flatten arrays. 2. **Array.prototype.flat()` (ES6+): A newer method introduced in ECMAScript 2019, which allows specifying the maximum nesting level. 3. **Recursive functions with memoization**: Another approach could be using recursive functions with memoization techniques to optimize performance for large or deeply nested arrays. In conclusion, this benchmark highlights the importance of choosing the right approach for flattening arrays depending on the specific use case and performance requirements. While `Array.flat` is often a good default choice, custom implementations like `deepFlat` can provide more control and flexibility for certain scenarios.
Related benchmarks:
Lodash Flatten vs Array.flat() with infinite
Lodash flattern vs flat
.flat vs _.flatten
_.flatten vs .flatMap
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