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lodash merge vs object.assign vs spread ыфвафыва
(version: 0)
Comparing performance of:
lodash merge 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 merge
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = _.merge(a, b);
object.assign
var a = { a: 'oh',фыb: 'my' }; var b = { c: 'goddess' }; 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 benchmark and its test cases. **What is being tested?** The benchmark measures the performance of three different approaches to merge two objects in JavaScript: 1. Lodash `_.merge()` 2. `Object.assign()` 3. Spread syntax (`{ ...a, ...b }`) These three approaches are compared to determine which one is the fastest. **Options being compared:** * **Lodash `_merge()`**: A utility function from the Lodash library that merges two objects recursively. * **`Object.assign()`**: A built-in JavaScript method that copies the properties of one or more source objects to a target object. * **Spread syntax (`{ ...a, ...b }`)**: An alternative syntax for merging objects using the spread operator. **Pros and Cons:** * **Lodash `_merge()`**: + Pros: Flexible, handles recursive merge, and can be used with other Lodash functions. + Cons: Requires an additional library (Lodash), may have a higher overhead due to its complexity. * **`Object.assign()`**: + Pros: Built-in, easy to use, and fast. + Cons: Only works for shallow merges, handles array merging differently than object merging. * **Spread syntax (`{ ...a, ...b }`)**: + Pros: Simple, modern syntax, and can handle shallow merges quickly. + Cons: Limited support on older browsers or with non-object data types. **Library usage:** The `lodash` library is used in the first test case to implement the `_merge()` function. The library provides a range of utility functions that can be imported and used in JavaScript code. **Special JS feature/syntax:** None mentioned specifically, but it's worth noting that the spread syntax (`{ ...a, ...b }`) is a relatively modern syntax introduced in ECMAScript 2018 (ES8). **Other alternatives:** Other approaches to merge objects include: * Using `Object.create()` and then assigning properties * Creating a new object with `Object.assign()` and then modifying it * Using a loop or recursion to manually iterate over properties However, these alternatives may be slower or more complex than the three options being compared in this benchmark.
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