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Spread vs forloop
(version: 0)
Comparing performance of:
Spread vs Forloop
Created:
5 years ago
by:
Guest
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Tests:
Spread
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = { ...firstObject, ...secondObject };
Forloop
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = { }; for (let item in firstObject) { finalObject[item] = firstObject[item]; } for (let item in secondObject) { finalObject[item] = secondObject[item]; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Spread
Forloop
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain the benchmark and its results in detail. **What is being tested?** The benchmark measures the performance difference between two approaches: using the spread operator (`...`) to merge objects, and using a traditional `for` loop with object iteration. In the first test case, "Spread", an object `firstObject` is created with some sample data, another object `secondObject` is created with more data, and then a new object `finalObject` is created by merging `firstObject` and `secondObject` using the spread operator (`...`). This approach creates a shallow copy of the original objects. In the second test case, "Forloop", an empty object `finalObject` is created, and then two `for` loops are used to iterate over the properties of `firstObject` and `secondObject`, respectively, and assign their values to `finalObject`. This approach creates a shallow copy of the original objects, but requires more explicit looping. **Options compared** The benchmark compares two approaches: 1. **Spread Operator**: Using the spread operator (`...`) to merge objects. 2. **Traditional Forloop**: Using a traditional `for` loop with object iteration. **Pros and Cons:** **Spread Operator:** Pros: * Concise and readable syntax * Fast and efficient, as it uses a built-in function Cons: * May not work correctly for nested objects or arrays * Can be slower for very large objects due to the overhead of creating a new object **Traditional Forloop:** Pros: * Works correctly for nested objects or arrays * Can be faster for very large objects, as it avoids the overhead of creating a new object Cons: * More verbose and less readable syntax * Slower and less efficient, as it uses explicit looping **Other considerations:** * Both approaches create a shallow copy of the original objects, which means that any changes made to the copied object will not affect the original object. * The benchmark does not consider the performance impact of other factors, such as array length or object size. **Library/Function used:** There is no library or function explicitly mentioned in the benchmark. However, it's worth noting that the spread operator (`...`) was introduced in ECMAScript 2018 (ES8) and is now widely supported by most modern browsers. **Special JS feature/syntax:** None are explicitly mentioned in the benchmark, but it's worth noting that the use of arrow functions (`=>`), classes (`class`), and template literals (`\`${...}\``) are some other examples of modern JavaScript features that may be used in more complex benchmarks. **Alternatives:** If you wanted to explore alternative approaches for merging objects, you could consider using: * Object.assign(): A built-in function that merges one or more source objects into a target object. * Array.prototype.slice() and Array.prototype.concat(): Methods that can be used to merge arrays or objects. * Immutable.js: A library that provides immutable data structures and operations. However, these alternatives may not provide the same level of performance or readability as the spread operator or traditional forloop.
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