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reassign vs assign
(version: 0)
Comparing performance of:
with re-assignment vs with Object.assign
Created:
3 years ago
by:
Guest
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Tests:
with re-assignment
let obj = {}; let obj2 = {one: 1, two : 2, three: 3, four : 4, five: 5 } obj = obj2;
with Object.assign
let obj = {}; let obj2 = {one: 1, two : 2, three: 3, four : 4, five: 5 } Object.assign(obj, obj2);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
with re-assignment
with Object.assign
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the explanation of what's tested in this benchmark. **Benchmark Overview** This benchmark compares two approaches for reassigning an object: using the assignment operator (`=`) and using the `Object.assign()` method. **Approach 1: Reassignment with Assignment Operator (`=`)** In this approach, the test code uses the assignment operator to reassign the value of a variable. Specifically, it creates a new object `obj2` with several properties and then assigns its value to the variable `obj`. The goal is to measure how fast the JavaScript engine can perform this assignment operation. **Approach 2: Reassignment using Object.assign()** In this approach, the test code uses the `Object.assign()` method to reassign the value of a variable. It creates a new object `obj2` with several properties and then calls `Object.assign()` on the `obj` variable, passing `obj2` as an argument. The goal is to measure how fast the JavaScript engine can perform this assignment operation. **Pros and Cons** * **Assignment Operator (`=`)**: + Pros: Simple and straightforward. + Cons: May not be optimized for performance due to its simplicity. * **Object.assign()**: + Pros: Can handle more complex assignment scenarios, such as merging multiple objects. + Cons: May introduce overhead due to the method call and object creation. **Other Considerations** * Both approaches create a new object on the heap, which can lead to garbage collection overhead. * The `Object.assign()` method may also perform additional checks, such as ensuring that the target variable is an object, which could introduce additional overhead. **Library and Special JS Features** There are no libraries used in this benchmark. Additionally, there are no special JavaScript features or syntax mentioned in the benchmark definition or test cases. **Alternative Approaches** Other possible approaches for reassigning an object could include: * Using a library like Lodash's `merge()` function * Using a custom implementation of assignment, such as using a closure or a function constructor * Using a different data structure, such as a typed array or a buffer However, these alternatives are not explored in this benchmark. **Benchmark Preparation Code** The script preparation code is empty, which means that the test code starts with a clean slate and does not include any additional setup or cleanup. The HTML preparation code is also empty, which suggests that no HTML-related setup or teardown is required for the test.
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