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Big spread vs assign
(version: 0)
Comparing performance of:
Object.assign vs Spread
Created:
2 years ago
by:
Guest
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Tests:
Object.assign
const firstObject = { sampleData: 'Hello world' } for (let i = 0; i < 10000; i++) { firstObject[i] = 'asdf' } const secondObject = { 1: 'foo bar' } const finalObject = Object.assign(firstObject, secondObject);
Spread
const firstObject = { sampleData: 'Hello world' } for (let i = 0; i < 10000; i++) { firstObject[i] = 'asdf' } const secondObject = { 1: 'foo bar' } const finalObject = {...firstObject, secondObject}
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Object.assign
Spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and its test cases. **Benchmark Overview** The benchmark, hosted on MeasureThat.net, compares two approaches to merge objects in JavaScript: using `Object.assign()` and using the spread operator (`...`). The goal is to determine which approach is faster and more efficient for large object merges. **Test Cases** There are only two test cases: 1. **"Object.assign"`**: This test case defines a large object `firstObject` with 10,000 properties, each initialized with a string value `'asdf'`. Another small object `secondObject` is defined with a single property `'foo bar'`. The test then merges the two objects using `Object.assign()`. 2. **"Spread"`**: This test case is identical to the first one, except it uses the spread operator (`...`) instead of `Object.assign()` to merge the two objects. **Libraries and Features** Neither of these tests requires any external libraries or special JavaScript features. They are designed to be self-contained and easy to understand. **Approaches Compared** The benchmark compares two approaches: 1. **`Object.assign()`**: This method takes multiple source objects as arguments and merges their properties into a target object. 2. **Spread Operator (`...`)**: This syntax allows you to create a new object by copying the properties from an existing object. **Pros and Cons of Each Approach** Here are some pros and cons of each approach: * `Object.assign()`: + Pros: Can handle multiple source objects, can be used with arrays. + Cons: Can be slower for large objects due to the overhead of function calls. + Example use case: Merging multiple form submission data objects. * Spread Operator (`...`): + Pros: Fast and efficient for small to medium-sized objects. + Cons: Only supports copying properties from a single object, not arrays. + Example use case: Creating a new object with a subset of properties. **Other Considerations** When choosing between these approaches, consider the size of your objects and the frequency of merges. For large objects or high-performance requirements, `Object.assign()` might be slower due to its overhead. However, for small objects or simple merges, the spread operator is likely a better choice. Keep in mind that the benchmark only tests object mergers, not property assignments or array concatenation, which can affect performance in different ways. **Alternatives** If you need to perform more complex operations, such as merging arrays or objects with nested structures, you might want to consider alternative approaches: * For merging arrays, use `concat()` or the spread operator (`...`) on arrays. * For merging objects with nested structures, consider using libraries like Lodash or UglifyJS. I hope this explanation helps!
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