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Array.from vs Spread with square
(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, i => i * i);
Spread
var fooSet = new Set(); for(var i=0;i<100;i++) { fooSet.add(i); } var other = [...fooSet].map(i => i * i);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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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 break down the provided benchmark and explain what's being tested. **Benchmark Purpose** The main goal of this benchmark is to compare the performance of two approaches: using `Array.from()` and spreading an object (using the spread operator `...`) to create a new array from a set. **Options Compared** There are two options compared: 1. **`Array.from()`**: This method creates a new array from an iterable or an array-like object. 2. **Spreading with square (`i => i * i`)**: This approach uses the spread operator `...` to create a new array, where each element is the square of its index. **Pros and Cons** * **`Array.from()`**: Pros: + Creates a new array from an iterable or an array-like object. + More explicit and readable code. + Less likely to lead to off-by-one errors. * Cons: + Can be slower than spreading due to the overhead of creating a new array. * Spreading with square (`i => i * i`): Pros: + Faster execution since it avoids creating a new array explicitly. + More concise code. * Cons: + Less readable code, especially for those unfamiliar with this approach. + May lead to off-by-one errors if not used carefully. **Library Used** There is no library explicitly mentioned in the benchmark definition or individual test cases. However, the `Set` data structure is a part of the JavaScript standard library. **Special JS Feature/Syntax** The use of arrow functions (`i => i * i`) is a relatively recent feature introduced in ECMAScript 2015 (ES6). It allows for concise function definitions using the `=>` operator instead of traditional function declarations or expressions. **Other Alternatives** In addition to `Array.from()` and spreading with square, there are other ways to create an array from a set: * Using the `map()` method: `fooSet.map(i => i * i)` * Using the `forEach()` method: `fooSet.forEach(i => (other[i] = i * i))` However, these approaches may not be as concise or readable as spreading with square. **Benchmark Preparation Code** The provided benchmark preparation code is empty, which means that no specific setup or initialization is required for the benchmark. The script is expected to run directly in the test environment. I hope this explanation helps!
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