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Object.assign vs spread operator (without jquery)
(version: 0)
Comparing performance of:
Object.assign vs spread operator
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({ a: 2 }, params);
spread operator
var params = { b:"hello", c: true, d:7 }; var other = { a: 2, ...params };
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Object.assign
spread operator
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks and explain what's being tested on MeasureThat.net. **Benchmark Definition** The benchmark is comparing two approaches to merge objects in JavaScript: 1. **`Object.assign()`**: This method takes multiple source objects and merges them into a single target object. 2. **Spread operator (`...`)**: This operator allows you to create a new object by spreading the properties of an existing object. **Options being compared** The benchmark is comparing the performance of these two approaches on a simple test case where we have an object `params` with four properties (b, c, d) and another object with one property (a). We then attempt to merge these two objects using `Object.assign()` or the spread operator. **Pros and Cons** * **`Object.assign()`**: + Pros: Well-established method, widely supported. + Cons: Can be slower than the spread operator for large datasets. * **Spread operator (`...`)**: + Pros: Faster, more concise way to merge objects. Works well with modern browsers. + Cons: Requires JavaScript 2.6 or later. **Library and special JS feature** There is no specific library used in this benchmark. However, the use of the spread operator (`...`) relies on a feature introduced in ECMAScript 2018 (ES9). **Other alternatives** Before the spread operator became widely supported, other methods were used to merge objects, such as: * **`for...in` loop**: Used `params` object's property names and assigned them to the target object. * **`Object.keys()`**, **`Array.prototype.forEach()`**: Used `Object.keys(params)` to get an array of property names and then iterated over it using `forEach()` to assign properties to the target object. **Benchmark preparation code** The benchmark preparation code is empty, which means that the test cases use a minimal setup. The HTML preparation code is also empty, indicating that no specific HTML setup is required for this benchmark. In summary, this benchmark tests the performance of two approaches to merge objects in JavaScript: `Object.assign()` and the spread operator (`...`). The spread operator is generally faster but requires JavaScript 2.6 or later.
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