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Mutate object or not
(version: 0)
Comparing performance of:
Not mutated vs Mutated
Created:
5 years ago
by:
Guest
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Tests:
Not mutated
let errors = { } errors = { ...errors, email: "not found" }
Mutated
const errors = { } errors.email = "Not found";
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Not mutated
Mutated
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the JavaScript microbenchmark on MeasureThat.net. **What is being tested?** The benchmark tests two different approaches to assigning a value to an object in JavaScript: 1. **Object assignment using `=`**: This approach assigns a new value to the entire object, as seen in the "Mutated" test case: `errors = { ...errors, email: "Not found" }`. 2. **Object property assignment using dot notation or bracket notation**: This approach directly sets a specific property on an existing object, as seen in the "Not mutated" test case: `errors.email = "Not found"`. **Options compared** The benchmark compares these two approaches: * **Pros of Object assignment using `=`**: + Can be useful when you need to completely replace an object with new data. + May be more concise than using bracket notation or dot notation for simple assignments. * **Cons of Object assignment using `=`**: + Can lead to unexpected behavior if the original object is still referenced elsewhere in the code, causing unintended updates. + May result in unnecessary memory allocations and copies, especially when working with large objects. * **Pros of Object property assignment using dot notation or bracket notation**: + More explicit and safe than `=` operator, reducing the risk of unintended updates. + Can be more efficient, as it only updates the specific property without modifying the entire object. * **Cons of Object property assignment using dot notation or bracket notation**: + May require more code to set each property individually. + Can lead to verbose and cumbersome assignments. **Library usage** There is no explicit library mentioned in the benchmark definition. However, the `const` keyword used in the "Mutated" test case implies that JavaScript's strict mode is enabled. **Special JS features or syntax** This benchmark does not rely on any special JavaScript features or syntax, making it accessible to a wide range of developers. **Other alternatives** To create similar benchmarks, you could consider testing: * Using `Object.assign()` instead of the assignment operator * Using destructuring assignments (e.g., `const { ...errors } = {...}`) * Using spread operators (`{...errors, email: "Not found"}`) or rest parameters (`({ ...errors, email }) => ({ ...errors, email: "Not found" })`) These alternatives can provide additional insights into the performance and efficiency of different JavaScript syntaxes.
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