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big data Array.from vs Spread
(version: 0)
Comparing performance of:
Array.from vs Spread
Created:
3 years ago
by:
Guest
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Tests:
Array.from
var fooSet = new Set(); for(var i=0;i<10000;i++) { fooSet.add(i); } var other = Array.from(fooSet);
Spread
var fooSet = new Set(); for(var i=0;i<10000;i++) { fooSet.add(i); } var other = [...fooSet];
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Suite status:
<idle, ready to run>
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Test case name
Result
Array.from
Spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks and explore what's being tested on MeasureThat.net. **Benchmark Overview** The benchmark compares two approaches for converting a Set object to an Array: `Array.from()` and the spread operator (`...`). A Set is a collection of unique values, similar to an array, but with faster lookup times. The test creates a Set with 10,000 elements and then converts it to an Array using each of these two methods. **Options Compared** The benchmark compares two options: 1. **Array.from()**: This method takes a Set or an iterable as an argument and returns a new Array with the same elements. 2. **Spread Operator (`...`)**: This operator can be used to create a new array from an iterable by spreading its elements. **Pros and Cons of Each Approach** * **Array.from()**: + Pros: - More explicit and readable - Less prone to errors (e.g., if the Set has duplicate values, Array.from() will not include duplicates in the resulting Array) + Cons: - May be slower due to the overhead of calling a method on an object * **Spread Operator (`...`)**: + Pros: - Faster and more efficient (since it's a simple operator) - More concise and readable for some use cases + Cons: - May be less explicit and more prone to errors (e.g., if the Set has duplicate values, the resulting Array will include duplicates) **Library Used** The benchmark uses the `Set` object, which is a built-in JavaScript library. **Special JS Feature or Syntax** None mentioned in the provided code snippets. **Other Considerations** When working with large datasets like this benchmark, it's essential to consider factors like memory allocation, garbage collection, and caching. In this case, both approaches should be relatively efficient, but the spread operator might have a slight edge due to its simplicity. If you're interested in exploring alternative approaches, here are some options: * **Iterators**: Instead of using `Array.from()` or the spread operator, you could use iterators to iterate over the Set's elements and create an Array from scratch. * **For...of Loop**: You could also use a For...of loop to iterate over the Set's elements and create an Array. Keep in mind that these alternative approaches might be less efficient or more verbose than using `Array.from()` or the spread operator.
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