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lodash assign vs object.assign vs spread asdfdsfasdfdsfdddd
(version: 0)
testing object assignment while keeping references to source
Comparing performance of:
lodash merge vs object.assign
Created:
6 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);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
lodash merge
object.assign
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview of the Benchmark** The provided JSON represents a JavaScript microbenchmark that compares three approaches for object assignment while keeping references to the source: `lodash.assign`, `Object.assign`, and spread syntax (`{ ... }`). **Approaches Compared** 1. **Lodash's `assign` function**: This is a utility function from the Lodash library, which provides a convenient way to merge objects. 2. **JavaScript's built-in `Object.assign` method**: This method allows assigning properties of one or more source objects to a target object. 3. **Spread syntax (`{ ... }`)**: This is a shorthand way to create a new object by copying the key-value pairs from an existing object. **Pros and Cons of Each Approach** 1. **Lodash's `assign` function**: * Pros: Convenient, readable code; handles nested objects; can be easily customized. * Cons: Requires an external library (Lodash); may have a performance overhead due to the additional function call. 2. **JavaScript's built-in `Object.assign` method**: * Pros: Fast and lightweight; part of the standard JavaScript API; no additional dependencies required. * Cons: Less readable code than Lodash's `assign` function; only works with objects, not arrays or other data structures. 3. **Spread syntax (`{ ... }`)**: * Pros: Simple and concise code; fast and efficient; works with objects, arrays, and other data structures. * Cons: Limited support for nested objects; may require additional manual configuration. **Library and its Purpose** The `lodash` library is a popular JavaScript utility library that provides a wide range of useful functions for tasks such as array manipulation, string manipulation, and object manipulation. In this benchmark, `lodash.assign` is used to compare with the built-in `Object.assign` method and spread syntax. **Special JS Feature/Syntax** The benchmark uses the spread syntax (`{ ... }`) to create a new object by copying key-value pairs from an existing object. This syntax was introduced in ECMAScript 2015 (ES6) as a shorthand way to create objects. **Other Alternatives** If you prefer not to use `lodash.assign` or the spread syntax, you can also use other approaches such as: * Using the `for...in` loop and manually copying properties from one object to another. * Using the `JSON.parse(JSON.stringify(obj))` trick (although this has some performance implications). * Creating a new object using the `Object.create()` method and then assigning properties to it.
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