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Destructuring assignment vs Set iterator
(version: 0)
Comparing performance of:
Destructuring assignment vs Set iterator
Created:
2 years ago
by:
Guest
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Tests:
Destructuring assignment
const mySet = new Set(); for (let i = 0; i < 10000; i++) { mySet.add(`my_id_${i}`); } const [myFirstSetElement] = mySet; console.log(myFirstSetElement);
Set iterator
const mySet = new Set(); for (let i = 0; i < 10000; i++) { mySet.add(`my_id_${i}`); } const myFirstSetElement = mySet.values().next().value; console.log(myFirstSetElement);
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Destructuring assignment
Set iterator
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.1:latest
, generated one year ago):
Let's break down the benchmark definition and results. **What is being tested?** The test case compares two approaches to retrieve the first element from a Set in JavaScript: 1. **Destructuring assignment**: `const [myFirstSetElement] = mySet;` 2. **Set iterator**: `const myFirstSetElement = mySet.values().next().value;` **What are the options being compared?** In this test case, two different approaches to retrieve the first element from a Set are being compared: * The first approach uses destructuring assignment (`const [myFirstSetElement] = mySet;`) to directly assign the first value from the Set to `myFirstSetElement`. * The second approach uses the `values()` method of the Set, which returns an iterator over the values in the Set, and then calls `next().value` on that iterator to retrieve the first value. **Pros and cons of each approach:** * **Destructuring assignment**: + Pros: More concise and expressive code. + Cons: Requires JavaScript 2015 (ECMAScript 2015) or later syntax support. In older browsers, it may not be supported. * **Set iterator**: + Pros: Works in all modern browsers that support the Set API (i.e., ECMAScript 6 or later). + Cons: Less concise and expressive than destructuring assignment. **Other considerations:** * The test case uses a large Set with 10,000 elements to stress-test both approaches. * The results are run on a single browser version (Firefox 115) to ensure consistent performance measurements. **Library usage:** None in this specific test case. However, the benchmark definition does not include any external libraries or dependencies. **JavaScript feature or syntax used:** The test case uses: * Destructuring assignment (`const [myFirstSetElement] = mySet;`) which is a JavaScript 2015 (ECMAScript 2015) feature. * The `values()` method of the Set API, which is part of ECMAScript 6. **Alternatives:** If you need to support older browsers that don't have destructuring assignment or modern Set API features, you can use the following alternatives: * Instead of destructuring assignment, you can use a simple assignment statement: `const myFirstSetElement = mySet.values().next().value;` * To get the first value from a Set in older browsers without Set iterator support, you can iterate over the values using a traditional for loop.
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