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Flat vs forEach + push
(version: 0)
Benchmark.js
Comparing performance of:
Flat vs forEach + push
Created:
5 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var myArray = []; var x = 2000; while (myArray.length < x) { myArray.push([{a: 'b'}]) }
Tests:
Flat
myArray .map((each) => { return each.map((deet) => { return { subject: deet.a }; }); }) .flat();
forEach + push
let newArr = [] myArray.forEach((each) => { return each.forEach((deet) => { newArr.push({ subject: deet.a }) }) })
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
Flat
forEach + push
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36
Browser/OS:
Chrome 125 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=533058" width="100%" height="500px"></iframe>
forEach + push
58K/s
Flat
22K/s
View exact numbers
Test name
Executions per second
✓
forEach + push
57,771 Ops/sec
Flat
22,107 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the benchmark and explain what's being tested, along with the pros and cons of each approach. **Benchmark Overview** The benchmark compares two approaches to flatten an array: 1. `flat()`: A built-in method in JavaScript arrays that returns a new array containing all elements from the original array. 2. `forEach()` + `push()`: A manual approach using the `forEach()` method to iterate over each element and push it into a new array. **What is being tested?** The benchmark measures the performance of these two approaches on a large input array (`myArray` with 2000 elements) in different browsers (Chrome 125). **Options Compared:** * `flat()`: This approach uses the built-in method to flatten the array. + Pros: - Fast and efficient, as it's implemented in native code. - Avoids manual iteration and array manipulation. + Cons: - May not work as expected if the input array contains non-array elements or if the `flat()` method is called recursively (e.g., with a nested array). * `forEach()` + `push()`: This approach uses the `forEach()` method to iterate over each element and push it into a new array. + Pros: - Works for arrays of any type, including non-array elements. - Can be more flexible when working with complex data structures. + Cons: - Slower than `flat()`, as it involves manual iteration and array manipulation. **Library Used:** There is no library explicitly mentioned in the benchmark code. However, if you're interested in exploring libraries that provide similar functionality, some popular options include: * Lodash (`_.flatten()`) or Ramda (`R.flatten()`) for functional programming styles. * Underscore.js (`_flatten()`), Backbone.js ( `_flatten`), or Mojs library for basic array manipulation. **Special JS Feature/Syntax:** There is no special JavaScript feature or syntax used in this benchmark. The code only uses standard JavaScript features, such as arrays, loops, and the `forEach()` method. **Other Considerations:** * **Input size**: The benchmark uses a large input array (`2000` elements) to test performance. * **Browser**: The benchmark is run in Chrome 125, which may have different performance characteristics compared to other browsers or versions. * **Device Platform and Operating System**: The benchmark runs on a Mac OS X 10.15.7 desktop device. **Alternative Approaches:** Other approaches to flatten an array include: * Using `Array.prototype.map()` with the `reduce()` method (e.g., `myArray.map((each) => each.reduce((acc, deet) => [...acc, { subject: deet.a }], [])`). * Utilizing libraries like Immutable.js or a custom implementation using a recursive function. Keep in mind that each approach has its trade-offs, and the best choice depends on your specific use case and requirements.
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