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Slice vs Map (jv)
(version: 0)
Benchmark.js
Comparing performance of:
slice vs map
Created:
3 years ago
by:
Guest
Go to the latest result
Tests:
slice
var array = Array.from({length: 100}).slice();
map
var array = Array.from({length: 100}).map((item) => item);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
slice
map
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
10 days ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:155.0) Gecko/20100101 Firefox/155.0
Browser/OS:
Firefox 155 on Mac OS X 10.15
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<iframe src="https://measurethat.net/Embed?id=634001" width="100%" height="500px"></iframe>
slice
4.0M/s
map
2.3M/s
View exact numbers
Test name
Executions per second
✓
slice
4,007,916 Ops/sec
map
2,289,513 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in the provided JSON benchmark. **Benchmark Definition** The benchmark definition is a simple JavaScript snippet that creates an array using `Array.from` and then either slices or maps over it. The purpose of this benchmark is to compare the performance of two methods: `slice` and `map`. **Options Compared** Two options are being compared: 1. **Slice**: This method creates a new array by taking a subset of elements from the original array. In this case, it's creating an array with 100 elements using `Array.from({length: 100}).slice()`. 2. **Map**: This method creates a new array by transforming each element in the original array and returning the results as a new array. In this case, it's mapping over the same array created using `Array.from({length: 100})` and applying the identity function (`(item) => item`) to each element. **Pros and Cons** Both methods have their pros and cons: * **Slice**: Pros: + More concise code + Can be faster for large arrays since it avoids the overhead of creating a new array with transformed elements. * Cons: + Only creates a subset of the original array, which can lead to memory issues if the slice size is very large. * **Map**: Pros: + Creates a new array with transformed elements, which can be useful for data transformations or filtering. + More flexible than `slice`, as it allows you to apply any transformation function. * Cons: + Can be slower for large arrays due to the overhead of creating a new array and applying the transformation function. **Library and Purpose** There is no specific library mentioned in the benchmark definition. However, `Array.from` is a built-in JavaScript method that creates a new array from an iterable object (such as an array or string). **Special JS Feature or Syntax** None are mentioned explicitly, but it's worth noting that `Array.from` is a modern JavaScript feature introduced in ECMAScript 2015. **Other Alternatives** If you were to rewrite this benchmark without using `Array.from`, you could use other methods such as: * Creating an array with `new Array(100)` and then slicing or mapping over it. * Using a loop to create the array and apply the transformation function. However, using `Array.from` is generally considered more concise and efficient, which is why it's the preferred method in this benchmark.
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