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lodash merge vs object.assign vs spread (no intermediate vars)
(version: 0)
Comparing performance of:
lodash merge vs object.assign vs spread
Created:
5 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 c = _.merge({ a: 'oh', b: 'my' }, { c: 'goddess' });
object.assign
var c = Object.assign({ a: 'oh', b: 'my' }, { c: 'goddess' });
spread
var c = { ...{ a: 'oh', b: 'my' }, c: 'goddess' };
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):
**What is being tested?** The provided JSON represents a benchmark test that compares the performance of three different approaches to merge two objects in JavaScript: `lodash.merge`, `Object.assign`, and the spread operator (`...`). The test case uses no intermediate variables. **Options comparison** Here's a brief overview of each approach, their pros and cons: 1. **Lodash Merge**: Lodash is a popular utility library that provides various functions for tasks like array manipulation, object merging, and more. `lodash.merge` takes two objects as input and returns a new object containing the merged properties. * Pros: Efficient, flexible, and well-maintained. * Cons: Requires an additional library, can be slower due to the overhead of importing it. 2. **Object.assign**: This is a built-in JavaScript method that copies properties from one or more source objects to a target object. * Pros: Fast, efficient, and part of the standard library. * Cons: Only works with objects, not arrays or other data types. 3. **Spread Operator (`...`)**: Introduced in ECMAScript 2015, the spread operator allows you to expand an array-like object into individual arguments. * Pros: Simple, concise, and part of the standard library. * Cons: Only works with objects, not arrays or other data types. **Library usage** The test uses the `lodash` library for the `lodash.merge` approach. Lodash is a popular utility library that provides various functions for tasks like array manipulation, object merging, and more. It's widely used in JavaScript applications due to its extensive feature set and efficient implementation. **Special JS features or syntax** There are no special JavaScript features or syntaxes used in this benchmark test. All three approaches use standard JavaScript constructs. **Other alternatives** If `lodash` is not an option, other alternatives for merging objects include: * Using the `Object.assign()` method with a third argument to specify the target object. * Implementing your own custom merge function using `for...in`, `Object.keys()`, and other built-in methods. * Utilizing a different library, such as `underscore.js` or `ramda`. However, it's worth noting that these alternatives might not be as efficient or concise as `lodash.merge` or the spread operator. **Benchmark interpretation** The benchmark results show the execution time (in executions per second) for each test case on a Chrome 86 browser running on Mac OS X 10.15.5. The top performer is `Object.assign`, followed by the spread operator, and then `lodash.merge`.
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