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Array.from(fooSet.values()) vs [...fooSet]
(version: 0)
Comparing performance of:
Array.from vs Spread
Created:
6 years ago
by:
Guest
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Tests:
Array.from
var fooSet = new Set(); for(var i=0;i<100;i++) { fooSet.add(i); } var other = Array.from(fooSet.values());
Spread
var fooSet = new Set(); for(var i=0;i<100;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. **Benchmark Definition** The provided JSON represents a benchmark test that compares two approaches: `Array.from(fooSet.values())` and `...fooSet`. The benchmark is designed to measure the performance difference between these two methods on an array created from a set. In JavaScript, sets are used to store unique values. When you iterate over a set using the `values()` method, it returns an iterator that yields the unique values in the set. However, when you use `Array.from()`, it converts the set into an array. **Options Compared** The two options being compared are: 1. **`Array.from(fooSet.values())`**: This approach creates a new array by iterating over the values of the set using the `values()` method and then converting the iterator to an array using `Array.from()`. 2. **`...fooSet`** (Spread syntax): This approach uses the spread operator (`...`) to create a new array by copying the elements from the set. **Pros and Cons** 1. `Array.from(fooSet.values())`: * Pros: Creates a new array with unique values, can be used to filter or transform data. * Cons: May have higher overhead due to iterator creation and conversion. 2. `...fooSet` (Spread syntax): * Pros: Can be more efficient than creating an intermediate array, as it creates the array in place. * Cons: Creates a new array with duplicate values if there are duplicates in the set. **Library and Purpose** In this benchmark, no libraries are explicitly mentioned. However, `Set` is a built-in JavaScript object that provides efficient lookup, insertion, and removal of unique elements. **Special JS Feature or Syntax** The spread operator (`...`) was introduced in ECMAScript 2015 (ES6) as part of the new syntax features. It allows you to create arrays from iterables, like sets, using a more concise syntax. **Other Alternatives** If the developers wanted to explore other approaches, they could consider: * Using `Array.from()` with an additional filter or map function to transform the data. * Using `Array.from()` with a custom iterator to skip duplicate values. * Implementing a custom set-based algorithm to avoid creating an array altogether. In conclusion, this benchmark test measures the performance difference between two approaches: using `Array.from(fooSet.values())` versus `...fooSet`. While both methods have their pros and cons, the spread operator (`...`) provides a concise way to create arrays from sets, but may not be suitable for all use cases.
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