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mapvsforEach
(version: 0)
Comparing performance of:
forEach vs Map
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var array = [ obj = { 'a': null, 'b': 1, 'c': null, 'd': 1, 'e': 1, 'f': 1, 'g': null, } ]
Tests:
forEach
array.forEach((obj) => { Object.keys(obj).forEach((key) => { if (obj[key] === null) delete obj[key] }) })
Map
array.forEach((obj) => { Object.keys(obj).map(key => key !== null) })
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
forEach
Map
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to help you understand the JavaScript microbenchmark on MeasureThat.net. **Benchmark Overview** The benchmark compares two approaches for removing null values from an object's properties using `Array.prototype.forEach()` and `Array.prototype.map()`. The test case uses an example object with multiple properties, some of which have null values. The goal is to measure which approach is faster and more efficient. **Options Compared** There are only two options being compared: 1. **forEach**: Uses the `forEach` method to iterate over the object's keys and delete any key-value pairs with a null value. 2. **Map**: Uses the `map` method to create a new array of keys that do not have null values. **Pros and Cons** * **forEach**: + Pros: More intuitive for iterating over an object's properties and deleting null values. + Cons: May be slower due to the overhead of calling `delete obj[key]`, which can lead to unnecessary garbage collection. * **Map**: + Pros: Can potentially be faster since it uses a vectorized operation, eliminating the need for explicit loops or `delete` statements. + Cons: Less intuitive for iterating over an object's properties and deleting null values. In general, using `forEach` might be more readable and maintainable, while `map` could provide a performance boost if implemented correctly. However, the actual execution time depends on various factors, including JavaScript engine optimizations and the specific use case. **Library and Features** There are no external libraries used in this benchmark, but it's worth noting that some modern JavaScript engines (e.g., V8) have optimized built-in functions for working with objects, which could potentially influence the results. No special JS features or syntax are being tested in this benchmark. The code is standard JavaScript, using only built-in methods and data types. **Alternatives** Other approaches to removing null values from an object's properties might include: * Using a `for...in` loop with `if (obj[key] !== undefined) delete obj[key];` * Using a library like Lodash or Ramda for functional programming * Using a custom function written in a different language (e.g., C++) and calling it from JavaScript Keep in mind that these alternatives might have different trade-offs in terms of performance, readability, and maintainability. If you'd like to experiment with this benchmark, MeasureThat.net provides an easy-to-use interface for creating and running your own microbenchmarks!
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