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lodash merge vs object.assign vs spread - brianblocker
(version: 0)
Comparing performance of:
lodash merge vs object.assign vs spread
Created:
3 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', 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 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 provided JSON and explain what is being tested. **Benchmark Overview** The benchmark measures the performance of three different approaches to merging objects in JavaScript: 1. `_.merge` from the Lodash library 2. `Object.assign` 3. Spread syntax (`{ ...a, ...b }`) **Lodash Merge** * Library: Lodash is a popular utility library for JavaScript. * Purpose: Provides a set of functional programming helpers, including the `merge` function. In this benchmark, the `_.merge` function is used to merge two objects, `a` and `b`, into a new object `c`. **Object.assign** * Library: Built-in JavaScript function * Purpose: Creates a new object by copying all enumerable own properties from one or more source objects. In this benchmark, the `Object.assign` function is used to merge two objects, `a` and `b`, into a new object `c`. **Spread Syntax** * Library: None (built-in JavaScript feature) * Purpose: Creates a new object by spreading the properties of an existing object. In this benchmark, the spread syntax `{ ...a, ...b }` is used to merge two objects, `a` and `b`, into a new object `c`. **Performance Comparison** The benchmark compares the performance of these three approaches across multiple executions per second. The results are likely used to determine which approach is the fastest. **Pros and Cons of Each Approach** * **_.merge**: Pros: + Provides a concise way to merge objects. + Can handle nested objects. Cons: + May not be as fast as other approaches (e.g., `Object.assign`). * **Object.assign**: Pros: + Fast and efficient. + Widely supported across browsers. Cons: + Can only handle two source objects at a time. + Not suitable for merging nested objects. * **Spread Syntax**: Pros: + Concise and readable. + Suitable for merging simple objects with few properties. Cons: + May not be as efficient as `Object.assign` for large objects or complex merges. **Other Alternatives** For more complex object merges, other approaches like `lodash.merge` or `merge2` (a newer library) might be suitable. For more advanced use cases, such as merging arrays or handling cyclic references, specialized libraries or functions might be necessary. In summary, this benchmark compares the performance of three popular ways to merge objects in JavaScript: Lodash's `_merge`, `Object.assign`, and spread syntax. The choice of approach depends on the specific use case, performance requirements, and personal preference.
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lodash merge vs object.assign vs spread overwriting one property
lodash merge vs object.assign vs spread (no intermediate vars)
lodash assign vs object.assign vs spread operator - variable and constant
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