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spread
(version: 0)
Comparing performance of:
explicitly vs spread
Created:
8 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var a = {x: 1, y: 100}
Tests:
explicitly
const b = {x: a.x, y: a.y}
spread
const b = {...a}
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
explicitly
spread
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the benchmark and its options, explaining what's being tested and the pros and cons of each approach. **Benchmark Overview** The `spread` benchmark measures how different JavaScript libraries handle spreading an object in two ways: 1. Using the syntax `{...a}` (dot spread) 2. Explicitly assigning properties to another object (`const b = {x: a.x, y: a.y}`) **Options Compared** We have two options being compared: ### 1. Dot Spread (`{...a}`) The dot spread syntax is a modern JavaScript feature introduced in ECMAScript 2018 (ES2018). It allows you to create a new object by copying the properties of an existing object using the spread operator. Pros: * Concise and readable * Efficient, as it avoids creating intermediate objects Cons: * Not supported in older browsers or environments that don't support ES2018 * May not work as expected if `a` is a complex object with nested properties **Library Used: None** The dot spread syntax is a built-in JavaScript feature and doesn't rely on any external library. However, the benchmark might be testing its performance compared to other libraries or methods. ### 2. Explicit Assignment (`const b = {x: a.x, y: a.y}`) This approach involves explicitly assigning each property of `a` to the corresponding property in `b`. This method is more verbose but ensures that all properties are copied correctly. Pros: * Works across older browsers and environments * Provides a clear and explicit way of copying object properties Cons: * More verbose and less readable than dot spread * May involve unnecessary operations, such as checking for null or undefined values **Library Used: None** Like the dot spread syntax, this approach is also built-in JavaScript and doesn't rely on any external library. **Other Considerations** When choosing between these two approaches, consider the specific requirements of your use case. If you need to support older browsers or environments, the explicit assignment method might be a better choice. However, if you're targeting modern browsers and want a concise solution, dot spread is likely the way to go. **Alternatives** If you're looking for alternative ways to spread objects in JavaScript, consider using libraries like Lodash (`_.cloneDeep`, `_mapValues`) or Underscore.js (`_.extend`). For example, using Lodash: ```javascript const _ = require('lodash'); // Using dot spread const a = { x: 1, y: 100 }; const b = _.cloneDeep(a); // Or using explicit assignment const c = {}; c.x = a.x; c.y = a.y; ``` Keep in mind that these alternatives might have their own pros and cons, depending on your specific use case.
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