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Array.prototype.concat vs spread operator - combine 2
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
3 years ago
by:
Guest
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Tests:
Array.prototype.concat
const params1 = [ 1, 2, {a:"5"} ]; const params2 = [ "hello", true, 7 ]; const other = [].concat(params1, params2);
spread operator
const params1 = [ 1, 2, {a:"5"} ]; const params2 = [ "hello", true, 7 ]; const other = [ params1, ...params2 ]
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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 on MeasureThat.net. **Benchmark Overview** The benchmark in question compares two approaches for combining arrays: `Array.prototype.concat()` and the new ES6 spread operator (`...`). The test case is designed to measure the performance difference between these two methods when working with mixed-type arrays, such as one containing numbers, strings, and objects. **Options Compared** Two options are being compared: 1. **`Array.prototype.concat()`**: A traditional method for combining arrays in JavaScript. It creates a new array by appending each element of the first array to the second array. 2. **Spread Operator (`...`)**: A newer method introduced in ES6 that allows for more concise and expressive array combination. **Pros and Cons** * `Array.prototype.concat()`: + Pros: Wide browser support, simple implementation. + Cons: Can be slower than spread operator due to the creation of a new array. * Spread Operator (`...`): + Pros: More concise, can lead to more readable code. Creates a new array but is often faster due to its optimized implementation. + Cons: Requires ES6 support, may not work in older browsers. **Library and Purpose** In this benchmark, the `concat()` method uses the `Array.prototype.concat()` function, which is built into JavaScript. The spread operator (`...`) does not require any libraries or external dependencies. **Special JS Feature/Syntax** The test case uses the ES6 spread operator (`...`), which was introduced in ECMAScript 2015. This feature allows for more concise and expressive array combination, making it a popular choice among modern JavaScript developers. **Other Alternatives** If you're interested in exploring alternative approaches to combining arrays, here are a few options: * `Array.prototype.push()`: Instead of creating a new array, you can use the `push()` method to add elements to an existing array. * `Array.prototype.concat.call()`: This method creates a new array by calling `concat()` on the first argument and passing the second argument as the only element to be appended. Keep in mind that these alternatives may have different performance characteristics or syntax requirements, so it's essential to evaluate them based on your specific use case.
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