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Array.prototype.concat vs spread operator performance!
(version: 1)
Compare the spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
5 years ago
by:
Registered User
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Tests:
Array.prototype.concat
const arr1 = [ "Happy", true, 10 ]; const arr2 = [ "coding", true, 110 ]; var result = arr1.concat(arr2);
spread operator
const arr1 = [ "Happy", true, 10 ]; const arr2 = [ "coding", true, 110 ]; var result = [ ...arr1, ...arr2];
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Suite status:
<idle, ready to run>
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Result
Array.prototype.concat
spread operator
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks. The provided JSON represents a benchmark test created on MeasureThat.net, which compares the performance of two approaches: using the `concat()` method and the spread operator (`...`) for concatenating arrays in JavaScript. Here's what's being tested: 1. **Array.prototype.concat**: This is the traditional way to concatenate arrays in JavaScript. It involves creating a new array and then adding elements from both input arrays to it. 2. **Spread operator (`...`)**: This syntax was introduced in ECMAScript 2015 (ES6) as a shorthand for creating a new array by iterating over elements from an existing array. **Options being compared** The benchmark is comparing the performance of these two approaches, specifically: * Execution frequency per second (`ExecutionsPerSecond`) * Total execution time **Pros and Cons of each approach:** 1. **Array.prototype.concat**: * Pros: + Wide browser support (backwards compatibility) + Well-established API * Cons: + Less efficient than the spread operator, especially for large arrays + May incur additional memory allocation 2. **Spread operator (`...`)**: * Pros: + More concise and expressive syntax + Can be more efficient, especially for large arrays * Cons: + Requires modern JavaScript engines (ECMAScript 2015 or later) + May not work in older browsers **Library usage** None of the benchmark tests use any external libraries. **Special JS feature/syntax** The benchmark uses the spread operator (`...`), which is a new syntax introduced in ECMAScript 2015. This allows for more concise array creation and concatenation. **Other alternatives** If you're interested in exploring alternative approaches to array concatenation, here are a few: * **Array.prototype.push()**: While not as efficient as the spread operator or `concat()`, using `push()` with an array as the first argument can be a viable option for some use cases. * **Array.reduce()**: This method can be used to concatenate arrays, but it's generally less efficient than the other two options. * **Custom implementation**: Depending on your specific requirements, you might choose to implement a custom function for concatenating arrays. Keep in mind that these alternatives may have trade-offs in terms of performance, readability, and maintainability.
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