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Spread operator vs Object.assign
(version: 0)
Comparing performance of:
Object.assign vs spread operator
Created:
6 years ago
by:
Guest
Jump to the latest result
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)
Previous results
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Test case name
Result
Object.assign
spread operator
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain the benchmark and its results in detail. **Benchmark Overview** The provided JSON represents a JavaScript microbenchmark test case created on MeasureThat.net. The benchmark compares the performance of two approaches: using `Object.assign()` versus the spread operator (`...`). **Approaches Compared** 1. **Object.assign()**: This is a method that copies all enumerable own properties from one or more source objects to a target object. 2. **Spread Operator (ES6+)**: The spread operator allows you to expand an array or object into individual elements, making it easier to work with arrays and objects in JavaScript. **Pros and Cons** **Object.assign():** Pros: * Wide support across browsers and versions * Simple and concise syntax Cons: * Can be slower than the spread operator due to its method call overhead * Requires a specific target object for assignment **Spread Operator:** Pros: * Fast execution, as it's optimized by modern JavaScript engines * Simplifies code and makes it more readable Cons: * Requires ECMAScript 2015 (ES6) or later support * May not work in older browsers or environments **Library and Special Features** In this benchmark, the `Object.assign()` method is used to assign properties from an object (`params`) to another object (`other`). The spread operator is used to expand the `params` object into individual elements and assign them to `other`. There are no special features or syntaxes involved in this benchmark. **Other Considerations** The benchmark uses a specific test case that creates two objects, `params` and `other`, where `params` contains several properties (`b: "hello"`, `c: true`, `d: 7`) to be assigned to `other`. The number of executions per second is reported for each test name. **Benchmark Results** The latest benchmark result shows the performance metrics for both approaches: | Test Name | Executions Per Second | | --- | --- | | Object.assign | 3581822.75 | | Spread Operator | 1990625.625 | In this case, the spread operator outperforms `Object.assign()` by approximately 80%. However, please note that these results may vary depending on the specific environment and browser used. **Alternatives** If you're interested in exploring alternative approaches or testing other JavaScript features, here are some options: 1. MeasureThat.net: The website offers a wide range of microbenchmarking tests for various JavaScript topics. 2. jsperf.com: A classic benchmarking website with a vast collection of tests, including those specific to JavaScript. 3. Benchmark.js: A lightweight JavaScript library for creating benchmarks and comparing performance between different implementations. These alternatives can provide more comprehensive testing options or help you explore other aspects of JavaScript performance optimization.
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