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Spread Operator: Object
(version: 1)
How To Accelerate the JavaScript Spread Operator https://dmitripavlutin.com/javascript-spread-operator-performance-optimization/
Comparing performance of:
Spread object at head vs Spread object at tail
Created:
5 years ago
by:
Registered User
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Tests:
Spread object at head
const object = {a: 1, b: 2, c: 3}; const result = {...object, d: 4};
Spread object at tail
const object = {a: 1, b: 2, c: 3}; const result = {d: 4, ...object};
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Suite status:
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Test case name
Result
Spread object at head
Spread object at tail
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Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll explain the benchmark and its components. **Benchmark Definition** The provided JSON represents a JavaScript microbenchmark that measures the performance of the spread operator in JavaScript. The benchmark is designed to accelerate the JavaScript spread operator, which is used to create new objects by spreading properties from an existing object. **Options Compared** In this benchmark, two approaches are compared: 1. **Spread Object at Head**: This approach uses the syntax `const result = {...object, d: 4};`, where the spread operator is applied to the `object` variable before assigning it to a new variable `result`. The spread operator creates a new object and copies all properties from `object` except for `d`. 2. **Spread Object at Tail**: This approach uses the syntax `const result = {d: 4, ...object};`, where the spread operator is applied after assigning values to `result`. **Pros and Cons of Each Approach** 1. **Spread Object at Head**: * Pros: + May be slightly more efficient since it avoids the need to create a new object with all properties from `object`. + Can take advantage of some optimizations in modern JavaScript engines. * Cons: + Requires creating a temporary variable, which can lead to additional memory allocation and deallocation overhead. 2. **Spread Object at Tail**: * Pros: + Only creates a new object with the required properties (`d: 4`), reducing memory allocation overhead. * Cons: + May require more iterations in the JavaScript engine's parser, potentially leading to slower performance. **Library and Special JS Features** None of the test cases use any external libraries or special JavaScript features. The benchmark only relies on built-in JavaScript functionality. **Other Alternatives** To accelerate the spread operator, other approaches could be explored, such as: * Using a custom implementation in native code (e.g., WebAssembly) * Optimizing the JavaScript engine's parser to handle the spread operator more efficiently * Utilizing SIMD instructions (Single Instruction, Multiple Data) to parallelize operations on arrays However, these alternatives are not included in this benchmark and require further investigation to determine their feasibility and performance benefits. I hope this explanation helps!
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