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Clone deep
(version: 0)
Comparing performance of:
spread vs cloneDeep
Created:
4 years ago
by:
Guest
Jump to the latest result
HTML Preparation code:
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
Script Preparation code:
var arr = new Array(100000000).fill(0);
Tests:
spread
[...arr];
cloneDeep
_.cloneDeep(arr);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
spread
cloneDeep
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down what's being tested in the provided JSON benchmark. **Benchmark Definition:** The benchmark measures how fast two different methods can clone a large array (100 million elements) in JavaScript. **Options Compared:** Two options are compared: 1. **Spread Syntax (`[...arr]`)**: This method uses the spread operator to create a new array with the same elements as `arr`. 2. **_.cloneDeep() from Lodash library**: This method is part of the popular Lodash library, which provides utility functions for functional programming tasks. _.cloneDeep() creates a deep copy of an object or array. **Pros and Cons:** * **Spread Syntax ( `[...arr]` )**: + Pros: concise, easy to read, and widely supported. + Cons: can be slower due to the overhead of creating a new array. * **_.cloneDeep() from Lodash library**: + Pros: more efficient than spread syntax for large arrays or complex objects, and provides additional functionality (e.g., cloning nested objects). + Cons: requires an external dependency (Lodash), can be slower due to the overhead of importing a library. **Library:** The `_.cloneDeep()` function is part of the Lodash library. Lodash provides various utility functions for functional programming tasks, such as array manipulation, object transformation, and more. **Special JS Feature/Syntax:** None mentioned in this benchmark. **Benchmark Preparation Code:** The script preparation code initializes an array `arr` with 100 million elements filled with zeros using the `Array.prototype.fill()` method. The HTML preparation code includes a link to include Lodash library in the benchmark. **Alternative Approaches:** Other alternatives for cloning arrays or objects might involve: * Using `JSON.parse(JSON.stringify(arr))`: This method creates a deep copy of an object, but it can be slower and less efficient than spread syntax or _.cloneDeep(). * Implementing custom cloning logic using recursion or iteration. * Utilizing modern JavaScript features like `Map` or `WeakMap` for creating clones. Keep in mind that these alternatives might have different performance characteristics and may not be as concise or readable as the options being compared.
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