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Lodash merge (new object) vs Lodash assign (new object) vs spread
(version: 0)
Comparing performance of:
Lodash merge vs Lodasg 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);
Lodasg 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
Lodasg assign
Spread
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in the provided JSON. **Benchmark Definition** The benchmark is testing three approaches to merging objects: 1. `_.merge({}, a, b)`: Using Lodash's `merge` function to combine two objects (`a` and `b`) into a new object. 2. `Object.assign({}, a, b)`: Using the spread operator (`...`) and the `Object.assign()` method to merge two objects (`a` and `b`) into a new object. 3. `{ ...a, ...b }`: Using the spread operator (`...`) to merge two objects (`a` and `b`) into a new object. **Options Compared** The benchmark is comparing the performance of these three approaches on different devices (desktops) with Chrome 92 browser. **Pros and Cons of Each Approach** 1. **_.merge({}, a, b)**: * Pros: Generally considered a safe and reliable way to merge objects. * Cons: Can be slower due to the overhead of function call and object creation. 2. **Object.assign({}, a, b)**: * Pros: Fast and efficient, as it leverages the browser's built-in `Object.assign()` method. * Cons: May not work correctly if `a` or `b` are not objects, leading to unexpected behavior. 3. **{ ...a, ...b }** (Spread Operator): * Pros: Very fast and efficient, as it leverages the browser's built-in spread operator support. * Cons: May not work correctly in older browsers that don't support the spread operator. **Libraries and Features** The benchmark uses Lodash, a popular JavaScript utility library. The `merge` function is a key part of Lodash, providing a safe and efficient way to merge objects. **Special JS Feature or Syntax** The benchmark uses the spread operator (`...`), which is a relatively new feature introduced in ECMAScript 2018 (ES2018). This allows for concise and expressive object merging, but may not be supported in older browsers. **Other Alternatives** If you need to merge objects without using Lodash or the spread operator, you can consider using other approaches, such as: * Using a library like `lodash.merge` or `merge-deep` * Implementing your own custom merge function * Using the `Object.assign()` method with multiple arguments (e.g., `Object.assign({}, a, b)`) However, keep in mind that these alternatives may have performance overhead or limitations compared to the spread operator and Lodash's `merge` function.
Related benchmarks:
lodash merge vs object.assign vs spread new obj
lodash.assign vs object.assign vs spread
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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