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spread operator vs object.assign (plain object)
(version: 0)
Comparing performance of:
spread operator vs object assign (plain object)
Created:
4 years ago
by:
Guest
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Tests:
spread operator
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = { ...firstObject, ...secondObject };
object assign (plain object)
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = Object.assign({}, firstObject, secondObject);
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Suite status:
<idle, ready to run>
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Test case name
Result
spread operator
object assign (plain object)
Fastest:
N/A
Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the benchmark and explain what's being tested. **Benchmark Definition** The benchmark compares two approaches for creating a new object by merging two existing objects: the spread operator (`...`) and `Object.assign()`. The test cases create two simple objects, `firstObject` and `secondObject`, with some sample data. Then, they define the final object that should result from merging these two objects using each approach. **Options Compared** There are two options being compared: 1. **Spread Operator (`...`)**: This operator creates a new object by iterating over the properties of an existing object (in this case, `firstObject` and `secondObject`). It takes the property names and values from both objects and adds them to the new object. 2. **Object.assign()**: This method creates a new object by copying all enumerable own properties from one or more source objects into a new object. **Pros and Cons** * **Spread Operator (`...`)**: + Pros: concise, readable, and efficient (it only iterates over the properties of the existing objects). + Cons: not supported in older browsers or environments that don't support modern JavaScript features. * **Object.assign()**: + Pros: widely supported, reliable, and can handle complex object merging scenarios. + Cons: more verbose, and it creates a new object with all properties from both sources (including inherited ones). **Library and Purpose** There is no explicit library mentioned in the benchmark definition. However, `Object.assign()` is a built-in JavaScript method that's widely supported across browsers and environments. **Special JS Feature or Syntax** The test case uses the spread operator (`...`), which is a modern JavaScript feature introduced in ECMAScript 2018 (ES2018). This syntax allows for more concise object merging and other features like destructuring. Not all browsers or environments support this feature, so it's essential to consider its compatibility when using it. **Other Alternatives** If you need to merge objects without using the spread operator or `Object.assign()`, you can also use other methods like: * **Concatenation**: `Object.concat()` (not recommended, as it creates a new object with only the last set of properties) * **Iteration**: Using `for...in` loops or `forEach()` to iterate over the properties of both objects and add them to the new object * **Library functions**: Depending on your specific use case, you might need to resort to third-party libraries that provide more robust object merging capabilities. Keep in mind that these alternatives can be less efficient or more verbose than using the spread operator or `Object.assign()`, so it's essential to evaluate their trade-offs depending on your project requirements.
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