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lodash merge vs object.assign vs spread (correct equivalence)
(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 = _.assign({}, 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)
Previous results
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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 benchmark and explain what's being tested, compared, and some considerations. **Benchmark Overview** The benchmark compares three ways to merge two objects in JavaScript: `_.assign` from Lodash library, `Object.assign` method, and spread operator (`{ ...a, ...b }`). The goal is to determine which approach is the fastest. **Libraries and Features Used** * **Lodash**: A popular utility library for JavaScript that provides a set of functional programming helpers. In this case, it's used for its `_.assign` function. * **Spread Operator (`{ ...a, ...b }`)**: Introduced in ECMAScript 2018 (ES2018), the spread operator is used to create a new object by copying properties from existing objects. **Test Cases** Each test case consists of: 1. A JavaScript snippet that defines two objects `a` and `b`, which will be merged using one of the three approaches. 2. The name of the approach being tested (e.g., "lodash merge", "object.assign", or "spread"). **Comparison** The benchmark tests each approach by executing it a large number of times (indicated by `ExecutionsPerSecond`) and comparing their performance. **Pros and Cons of Each Approach:** 1. **Lodash's _.assign**: Fast, lightweight, and widely supported. However, it may require additional dependency (Lodash) and has a slightly higher memory overhead compared to other approaches. 2. **Object.assign**: Native JavaScript method that's fast and efficient. It's also widely supported, but some older browsers might not have this method available. 3. **Spread Operator (`{ ...a, ...b }`)**: Fast, lightweight, and easy to read. However, it was introduced in ES2018, so some older browsers or environments might not support it. **Considerations** * When working with large datasets, the spread operator might be a good choice due to its simplicity and performance. * If you need to support older browsers or environments that don't have the spread operator available, `Object.assign` is still a viable option. * Lodash's _.assign can provide additional utility functions beyond just merging objects. **Alternatives** If you're looking for alternative approaches, consider: 1. **Using `reduce()` method**: Instead of using object merge methods like `_.assign`, `Object.assign`, or spread operator, you could use the `reduce()` method to achieve similar results. 2. **JSON Merge Libraries**: There are libraries like JSON Merge (npm package) that provide a simpler and more concise way to merge objects. In summary, the benchmark compares three approaches to merging objects in JavaScript: Lodash's _.assign, Object.assign method, and spread operator. Each approach has its pros and cons, and the choice ultimately depends on your specific use case and requirements.
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lodash assign vs object.assign vs spread operator - variable and constant
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