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Object cloning with Lodash cloneDeep vs merge
(version: 0)
Comparing performance of:
Lodash cloneDeep vs Lodash merge
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>
Script Preparation code:
var o = { a: { b: 1, c: 2, d: 3, j: { k: [1,2,3], l: [4,5,6] }, }, e: [1,2,3,4,5,6], f: 1, g: { h: 1, } }
Tests:
Lodash cloneDeep
const a = _.cloneDeep(o)
Lodash merge
const a = _.merge({}, o)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Lodash cloneDeep
Lodash merge
Fastest:
N/A
Slowest:
N/A
Latest run results:
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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 is measuring the performance difference between two approaches: cloning and merging objects using Lodash. **Script Preparation Code** The script defines an object `o` with nested properties, including arrays. It also defines a separate array `e`, a number `f`, and another object `g`. **Html Preparation Code** The HTML code includes a script tag that loads the Lodash library version 4.17.5. **Individual Test Cases** ### **Lodash cloneDeep** This test case creates an instance of Lodash's `cloneDeep` function, which recursively clones a nested object, including arrays and objects. * The purpose of this test is to measure how efficient it is to create a deep copy of the input object `o`. * The benefits of using `cloneDeep` include: * It creates an entirely independent clone of the original object, which can be useful in scenarios where you need to modify a copy without affecting the original data. * It handles complex nested structures, such as arrays and objects with their own properties. However, there are also some potential drawbacks: * Creating a deep copy can be computationally expensive, especially for large or deeply nested objects. * If the input object contains many small, lightweight properties, `cloneDeep` may create an unnecessarily large clone. **Lodash merge** This test case uses Lodash's `merge` function to create a new object by combining two existing objects. The first object is an empty object `{}`, and the second object is the original `o`. * The purpose of this test is to measure how efficient it is to merge two objects into one. * The benefits of using `merge` include: * It efficiently combines the properties of two objects, including arrays and objects with their own properties. * It can be faster than creating a new object from scratch or iterating over each property. However, there are also some potential drawbacks: * If the input objects contain many small, lightweight properties, `merge` may create an unnecessarily large merged object. * Depending on the specific use case, using `merge` might not always produce the desired result if the two objects have conflicting properties. **Other Considerations** When deciding between `cloneDeep` and `merge`, consider the following factors: * **Data structure complexity**: If your data is deeply nested or has complex relationships, `cloneDeep` might be a better choice. However, if your data is relatively flat or simple, `merge` could be more efficient. * **Performance requirements**: In scenarios where every millisecond counts, consider the execution time and overhead of each approach. * **Code readability and maintainability**: Choose an approach that clearly conveys the intent of your code and avoids unnecessary complexity. **Alternatives** If you're looking for alternative approaches to cloning or merging objects in JavaScript, consider: * Using the `Object.assign()` method: This method creates a new object by copying the properties from one or more source objects. * Using a library like Immutable.js: This library provides immutable data structures and operations that can be useful when working with complex, nested data. * Implementing your own cloning or merging logic: Depending on your specific requirements, you might need to roll out your own implementation of these functions.
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