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Object.assign vs. JSON String/Parse tdamon
(version: 0)
Creating a "new" object reference every time
Comparing performance of:
Spread operator vs JSON Parse vs Object.assign
Created:
6 years ago
by:
Guest
Jump to the latest result
Tests:
Spread operator
var n = {foo: 'bar', hello: [{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'}]}; while(n.length < 1000) { n = {...n}; }
JSON Parse
var n = {foo: 'bar', hello: [{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'}]}; while(n.length < 1000) { n = JSON.parse(JSON.stringify(n)) }
Object.assign
var n = {foo: 'bar', hello: [{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'}]}; while(n.length < 100) { n = Object.assign({}, n); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Spread operator
JSON Parse
Object.assign
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 provided benchmark and explain what is being tested, compared options, pros and cons of those approaches, and other considerations. **Benchmark Overview** The benchmark compares three different methods for creating and manipulating objects in JavaScript: 1. **Spread Operator**: Creating a new object reference using the spread operator (`{...n}`). 2. **JSON Parse/Parse String**: Using `JSON.parse(JSON.stringify(n))` to create a deep copy of an object. 3. **Object.assign**: Using `Object.assign({}, n)` to create a shallow copy of an object. **Benchmark Comparison** Here's a brief overview of each method: * **Spread Operator ( `{...n}` ) **: This method creates a new object reference by spreading the properties of `n` into a new object. The resulting object is not a deep copy, but rather a shallow copy of the original object's properties. * Pros: Lightweight and fast, as it only copies the top-level properties of the object. * Cons: Does not work for objects with complex structures or nested arrays. * **JSON Parse/Parse String ( `JSON.parse(JSON.stringify(n))` )**: This method creates a deep copy of an object by serializing it to JSON and then parsing the resulting string back into a new object. However, this approach can be slow and may not work for all types of objects (e.g., Date objects). * Pros: Works for complex structures and nested arrays, but can be slow. * Cons: May not work for certain types of objects (e.g., Date objects), and can be slower than the spread operator. * **Object.assign ( `Object.assign({}, n)` )**: This method creates a shallow copy of an object by assigning its properties to a new object. It works well for simple objects, but may not work as expected for complex structures or nested arrays. * Pros: Works well for simple objects and is generally faster than JSON parsing. * Cons: Does not work for complex structures or nested arrays. **Other Considerations** * **Memory Usage**: All three methods have different memory implications. The spread operator creates a new object reference with the same size as the original object, while Object.assign creates a shallow copy that uses less memory. JSON parsing can be slower and may use more memory due to string creation. * **Browser Support**: While all three methods are supported by modern browsers, older browsers may not support some of these features. **Latest Benchmark Results** The latest benchmark results show the performance differences between the three methods: * The spread operator performs best with 706660864 executions per second (Chromium 80 on Ubuntu). * JSON parsing is slightly slower than the spread operator but faster than Object.assign. * Object.assign is the slowest of the three, likely due to its shallow copying nature. **Alternatives** If you need a more robust or efficient way to copy objects in JavaScript, consider using libraries like Lodash's `_.cloneDeep()` function or the `copy` library. These libraries provide deep cloning capabilities and can be more reliable than manual implementation methods.
Related benchmarks:
Deep Clone Object: JSON.parse vs Object.assign
Object.assign vs direct copy
Object copy JSON vs Object.assign
Object.assign vs spreading object copy
Object.assign vs mutation
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