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Array.reduce2
(version: 0)
Comparing performance of:
Using the spread operator vs Using Object.assign vs Returning the reference
Created:
7 years ago
by:
Guest
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Tests:
Using the spread operator
const users = [{ id: 1, name: 'foo' }, { id: 2, name: 'bar' }] users.reduce((x, user) => ({...x, [user.id]: user}), {});
Using Object.assign
const users = [{ id: 1, name: 'foo' }, { id: 2, name: 'bar' }] users.reduce((x, user) => Object.assign(x, { [user.id]: user }), {});
Returning the reference
const users = [{ id: 1, name: 'foo' }, { id: 2, name: 'bar' }] users.reduce((x, user) => { x[user.id] = user; return x; }, {});
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
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Test case name
Result
Using the spread operator
Using Object.assign
Returning the reference
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 JSON and analyze what's being tested. **Benchmark Definition** The benchmark definition is a simple JavaScript function that performs an array reduction on an object. The purpose of this function is to take an array of objects, where each object has an `id` property and a `name` property, and merge them into a single object. The function uses the `reduce()` method to iterate over the array and create the new object. **Options being compared** There are three different approaches being tested: 1. **Using the spread operator**: This approach uses the `Object.assign()` method with the spread operator (`...`) to merge the objects. 2. **Using Object.assign()**: This approach uses the `Object.assign()` method without the spread operator to merge the objects. 3. **Returning the reference**: This approach returns a new object from the reducer function, which allows the original object to be modified. **Pros and Cons of each approach** 1. **Using the spread operator** * Pros: + More concise and expressive code + Allows for easy handling of nested objects * Cons: + May not work as expected in older browsers that don't support the spread operator 2. **Using Object.assign()** * Pros: + Works in older browsers that don't support the spread operator + Easy to understand and implement * Cons: + Can lead to unnecessary cloning of objects, which can impact performance 3. **Returning the reference** * Pros: + Allows for easy modification of the original object + May be more efficient than using `Object.assign()` * Cons: + Requires careful consideration of how the reducer function interacts with the original object **Library usage** There is no explicit library usage in these benchmark definitions. However, it's worth noting that the `reduce()` method and `Object.assign()` are built-in JavaScript methods. **Special JS features or syntax** The only special feature being tested is the spread operator (`...`), which was introduced in ECMAScript 2015 (ES6). The other two approaches use older methods (`Object.assign()`) that were available before ES6. If you're interested in testing performance with newer JavaScript features, you might consider adding additional benchmark definitions. **Other alternatives** If you want to test alternative approaches or libraries for array reduction, here are a few ideas: 1. **Lodash**: Lodash is a popular utility library that provides a `mapObject()` function for merging objects. 2. **Array.prototype.reduceWith()**: Some browsers (like Chrome) provide an extension of the `reduce()` method called `reduceWith()`, which allows for more flexible reduction functions. 3. **Custom implementation**: You could also test custom implementations of array reduction, such as using a simple loop or recursion. I hope this helps! Let me know if you have any further questions.
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