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lodash.merge vs object.assign vs spread
(version: 0)
Comparing performance of:
lodash merge vs object.assign vs spread
Created:
7 years ago
by:
Guest
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HTML Preparation code:
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
Tests:
lodash merge
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = _.merge({}, a, b);
object.assign
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = Object.assign({}, a, b);
spread
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = { ...a, ...b };
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
lodash merge
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 provided benchmarking test cases. **Benchmark Definition** The benchmark measures the performance of three approaches to merge two objects in JavaScript: `_.merge` from Lodash, `Object.assign`, and the spread operator (`...`). The purpose of this benchmark is to compare the efficiency of these approaches when merging two objects with different properties. **Options Compared** * `_._merge`: This function merges two objects into a new object. + Pros: Easy to use, straightforward syntax. + Cons: May have performance overhead due to its own implementation logic. * `Object.assign()`: This method copies the values of an object from one or more source objects to a target object. + Pros: Fast and efficient, widely supported. + Cons: Syntax can be verbose for complex merges. * Spread Operator (`...`): This operator merges two or more objects into a new object. + Pros: Concise syntax, easy to read. + Cons: Not all browsers support the spread operator. **Library Used** The `_.merge()` function is part of Lodash, a popular JavaScript utility library that provides various functional programming helpers. The purpose of Lodash is to simplify common tasks and make code more concise. **Special JS Feature/Syntax** * None mentioned in this benchmark. However, note that the spread operator (`...`) was introduced in ECMAScript 2018 (ES8) and might not be supported by older browsers. **Other Considerations** When choosing between these approaches, consider the following factors: * Code readability: If code maintainability is important, `_.merge()` or the spread operator might be a better choice due to their concise syntax. * Performance-critical code: For critical performance paths, `Object.assign()` might be the most efficient option due to its native implementation and fast execution. **Alternatives** If you need alternative approaches for merging objects in JavaScript: * Use the recursive merge function from another library like `jsonmerge`. * Implement your own merge function using techniques like union or intersection. * Consider using a JSON serialization/deserialization library that provides merge functionality. Keep in mind that these alternatives might not be as efficient or widely supported as the options covered in this benchmark.
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