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Manual vs Object.assign
(version: 0)
Comparing performance of:
Manual assign vs Object.assign vs Direct
Created:
3 years ago
by:
Registered User
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Tests:
Manual assign
const a = {}; a.b = 1; a.c = 1; a.d = 1; a.e = 1; a.f = 1; a.g = 1; a.h = 1; a.i = 1;
Object.assign
const a = {}; Object.assign(a, { b: 1, c: 1, d: 1, e: 1, f: 1, g: 1, h: 1, i: 1 });
Direct
const a = { b: 1, c: 1, d: 1, e: 1, f: 1, g: 1, h: 1, i: 1 };
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
Manual assign
Object.assign
Direct
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview of the Benchmark** The provided benchmark measures the performance difference between three approaches in JavaScript: manual assignment, `Object.assign()`, and direct object literal creation. **Approaches Compared** 1. **Manual Assignment**: This approach involves manually assigning values to each property of an object using dot notation (e.g., `a.b = 1;`). 2. **Object.assign()**: This approach uses the `Object.assign()` method to assign properties from one or more source objects to a target object. 3. **Direct Object Literal Creation**: This approach involves creating an object literal with all properties assigned at once (e.g., `{ b: 1, c: 1, ... }`). **Pros and Cons of Each Approach** 1. **Manual Assignment**: * Pros: Simple to understand and implement, no additional libraries required. * Cons: Inefficient due to repeated property accesses and assignments, may lead to performance issues in large codebases. 2. **Object.assign()**: * Pros: Efficient and concise, eliminates the need for manual loop or iteration. * Cons: Requires the `Object` object and its methods to be available, which might not be present in all environments (e.g., older browsers). 3. **Direct Object Literal Creation**: * Pros: Concise and readable, avoids unnecessary iterations and assignments. * Cons: May require additional memory for creating a temporary object if not executed immediately. **Libraries Used** None are explicitly mentioned in the provided benchmark definition or test cases. However, `Object.assign()` relies on the `Object` object, which is a built-in JavaScript object. **Special JS Features/Syntax** There are no special JavaScript features or syntax used in this benchmark that would require additional explanation. **Other Alternatives** For more efficient property assignment methods: 1. **Array.prototype.forEach()**: Assigning properties to an array using `forEach()` can provide better performance and readability than manual loops. 2. **Object.create() + Object.assign()**: Creating a new object using `Object.create()` and then assigning properties using `Object.assign()` can be more efficient than manual assignment. Keep in mind that the best approach depends on your specific use case, codebase size, and performance requirements.
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