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Object.assign vs spread operator123
(version: 0)
123
Comparing performance of:
Object.assign vs spread operator vs jQuery extend
Created:
7 years ago
by:
Guest
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Tests:
Object.assign
var params = { b:"hello", c: true, d:7 }; var other = Object.assign({}, params); other.b = {a:1}
spread operator
var params = { b:"hello", c: true, d:7 }; var other = { ...params, b:{a:1}};
jQuery extend
var params = { b:"hello", c: true, d:7 }; var other = { ...params}; other.b = {a:1}
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Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
Object.assign
spread operator
jQuery extend
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** MeasureThat.net is a platform that allows users to create and run JavaScript microbenchmarks. The provided benchmark measures the performance of three approaches for assigning properties to an object: `Object.assign()`, spread operator (`...`), and jQuery extend. **Options Compared** The benchmark compares the following options: 1. **`Object.assign()`**: A method that copies all enumerable own properties from one or more source objects to a target object. 2. **Spread Operator (`...`)**: A syntax that allows creating new objects by spreading existing objects' properties onto a new object. 3. **jQuery extend**: A jQuery-specific function that merges two objects into the first one. **Pros and Cons of Each Approach** 1. **`Object.assign()`**: * Pros: Simple, widely supported, and well-documented. * Cons: Can be slower than other approaches due to its method call overhead and potential object creation costs. 2. **Spread Operator (`...`)**: * Pros: Concise and readable syntax, often faster than `Object.assign()` due to less overhead. * Cons: Requires modern browsers or polyfills for older browsers. 3. **jQuery extend**: * Pros: Familiar syntax for developers familiar with jQuery, potentially faster than `Object.assign()`. * Cons: Less widely supported and well-documented compared to other approaches. **Library Usage** None of the benchmarked options require a library beyond the built-in JavaScript functionality. However, if you're interested in exploring more advanced libraries or tools, there are alternatives available: 1. **Lodash**: A popular utility library that provides `assign()` and other functions for merging objects. 2. **Underscore.js**: Another utility library that offers `extend()` and other object manipulation functions. **Special JS Features** The benchmark doesn't use any special JavaScript features beyond the standard language syntax. The options compared are all widely supported across modern browsers. **Other Alternatives** If you're interested in exploring alternative approaches or libraries for merging objects, consider: 1. **`.concat()`**: A method that combines two arrays (or other iterable objects) into a new array. 2. **`Object.merge()`**: A hypothetical function that merges multiple objects into one, similar to `Object.assign()`. 3. **Other library functions**: Depending on your specific requirements, you might find alternative libraries like Lodash or Underscore.js offering more comprehensive object merging functionality. When choosing an approach for merging objects in JavaScript, consider factors such as performance, code readability, and compatibility with different browsers and environments.
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