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lodash extend vs object.assign vs spread
(version: 0)
Comparing performance of:
lodash extend vs object.assign vs spread
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 extend
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = _.extend(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 extend
object.assign
spread
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 benchmark measures the performance difference between three approaches to merge two objects in JavaScript: `_.extend()` from Lodash, `Object.assign()`, and the spread operator (`{ ...a, ...b }`). The test cases are designed to exercise these functions with simple object merges. **Options Compared** * **Lodash _.extend()**: This function is part of the Lodash library, which provides a utility belt for functional programming in JavaScript. It takes two objects as arguments and returns a new object that combines their properties. * **Object.assign()**: This is a built-in JavaScript method that assigns values from one or more source objects to a target object. It is often used for simple object merges. * **Spread operator (`{ ...a, ...b }`)**: Introduced in ECMAScript 2018, the spread operator allows you to merge two objects into a new object. **Pros and Cons of Each Approach** * **Lodash _.extend()**: Pros: + Can handle nested objects and arrays. + Often considered more readable than `Object.assign()` or the spread operator. + Part of a larger library, which might be desirable for specific use cases. * Cons: + Requires importing an additional library (Lodash). + May have overhead due to the need to execute the _.extend() function. * **Object.assign()**: Pros: + Fast and lightweight. + Built-in method makes it easy to remember. + Works well for simple object merges. * Cons: + Can be less readable than `_.extend()` or the spread operator, especially for nested objects. + Does not handle arrays or other complex data types as well as _.extend(). * **Spread operator (`{ ...a, ...b }`)**: Pros: + Fast and lightweight. + Readable and intuitive syntax. + Works well for simple object merges. * Cons: + Only available in modern JavaScript environments (ECMAScript 2018+). + Requires familiarity with the spread operator syntax. **Library: Lodash** Lodash is a popular JavaScript library that provides a collection of utility functions, including _.extend(). It was created by Isaac Schlueter and released under the MIT License. Lodash has become an essential tool for many developers due to its comprehensive set of functional programming helpers. **Special JS Feature or Syntax (None)** There are no special JavaScript features or syntax used in this benchmark beyond what is standard for JavaScript. **Alternatives** If you don't want to use a library like Lodash, you can consider the following alternatives: * Use `Object.assign()` directly, as it is built-in and simple. * Use the spread operator (`{ ...a, ...b }`) with modern JavaScript environments (ECMAScript 2018+). * Implement your own merge function using basic JavaScript operations.
Related benchmarks:
lodash.assign vs object.assign vs spread
lodash assign vs spread
lodash assign vs object.assign vs spread operator - variable and constant
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Lodash.assign vs Object.assign vs spread assign
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