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JS Object assign vs object new property 2
(version: 0)
Comparing performance of:
Object assign vs Object new property
Created:
5 years ago
by:
Guest
Go to the latest result
Tests:
Object assign
const firstObject = { sampleData: 'Hello world' } Object.assign(firstObject, { moreData: 'foo bar' })
Object new property
const firstObject = { sampleData: 'Hello world' } firstObject.moreData = 'foo bar';
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
Object new property
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0
Browser/OS:
Firefox 138 on Windows
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<iframe src="https://measurethat.net/Embed?id=606778" width="100%" height="500px"></iframe>
Object new property
112.3M/s
Object assign
15.6M/s
View exact numbers
Test name
Executions per second
✓
Object new property
112,300,512 Ops/sec
Object assign
15,563,778 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested. **Benchmark Definition** The benchmark definition is an object that contains metadata about the test case, but it seems to be incomplete or empty in this example. Typically, a benchmark definition would specify the parameters, inputs, and expected outputs of the test case. However, looking at the individual test cases, we can infer what's being tested: * The first test case uses `Object.assign()` to merge two objects. * The second test case uses the dot notation (`firstObject.moreData = 'foo bar';`) to add a new property to an object. **Options Compared** The two options compared are: 1. Using `Object.assign()` to merge two objects. 2. Using the dot notation to add a new property directly to an existing object. **Pros and Cons of Each Approach** * **Using `Object.assign()`**: This approach has several pros: + It's widely supported across browsers and versions. + It's more flexible, as it allows for merging multiple objects into one. + However, it can be slower than the dot notation approach due to the overhead of creating a new object and then copying its properties. * **Using the dot notation**: This approach has several pros: + It's typically faster than `Object.assign()` because it avoids the overhead of creating a new object. + It's more concise and easier to read in some cases. However, it also has some cons: + It's not as flexible as `Object.assign()`, as it only allows for adding one property at a time. + It may not be supported by older browsers or versions. **Library Usage** In the first test case, the library used is `Object`. The purpose of this library is to provide an object-oriented programming model that allows you to create and manipulate objects in JavaScript. **Special JS Features/Syntax** Neither of the two approaches uses any special JavaScript features or syntax. They are both standard JavaScript constructs that have been part of the language for a long time. **Other Alternatives** If you want to compare the performance of other ways to merge or add properties to an object, some alternatives could include: * Using `JSON.parse(JSON.stringify(obj))` to create a deep copy of an object and then modify it. * Using the spread operator (`{ ...obj, newProp: 'value' }`) to create a new object with merged properties. However, these approaches are not typically used in production code, as they can be slower and less efficient than the dot notation approach.
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