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spread vs object
(version: 0)
Comparing performance of:
spread vs non spread
Created:
8 years ago
by:
Guest
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Tests:
spread
x = {a: 10, b: 20, c: 30} x = {...x, d: 100}
non spread
x = {a: 10, b: 20, c: 30} x.d = 100
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
spread
non 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, compared, and the pros and cons of each approach. **Benchmark Definition** The benchmark is testing two approaches for assigning values to objects in JavaScript: 1. Using the spread operator (`{...x, d: 100}`) 2. Assigning a property directly to an object (`x.d = 100`) **Options being compared** Two options are being compared: a. **Spread Operator**: `x = {a: 10, b: 20, c: 30}\r\nx = {...x, d: 100}` b. **Direct Assignment**: `x = {a: 10, b: 20, c: 30}\r\nx.d = 100` **Pros and Cons of each approach** **Spread Operator (Option a)** Pros: * More explicit and readable code * Can be used to create new objects by copying existing ones * Can be used to merge objects in a more controlled way Cons: * May have performance overhead due to the creation of a new object * Can lead to memory allocation issues if not used carefully **Direct Assignment (Option b)** Pros: * Fast and efficient, as it only assigns a value to an existing property * Less memory allocation overhead compared to the spread operator Cons: * May lead to confusion or misreading code, especially for less experienced developers * Can be less readable and maintainable due to the implicit assignment of values **Library and syntax considerations** In this benchmark, there is no specific library being used. However, it's worth noting that the use of spread operator has become a widely adopted convention in modern JavaScript development. **Special JS feature or syntax** There is no special JS feature or syntax being tested in this benchmark. The code snippets only involve basic object literals and assignment operations. **Other alternatives** If you wanted to test alternative approaches, some other options could be considered: * Using `Object.assign()` to assign values to an object * Using a library like Lodash's `assignIn()` function to assign values to an object * Testing the use of a specific JavaScript engine or runtime that optimizes or penalizes one approach over the other It's worth noting that benchmarking can be complex and nuanced, as different browsers and engines may optimize code differently. The spread operator has become a widely adopted convention in modern JavaScript development, but it's still interesting to see how different approaches compare in terms of performance. In conclusion, this benchmark provides a clear comparison between two common ways of assigning values to objects in JavaScript: the spread operator and direct assignment. By understanding the pros and cons of each approach, developers can make informed decisions about which approach to use in their own code.
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