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Array Spread vs concat
(version: 0)
Comparing performance of:
Array Concat vs Spread Operator
Created:
7 years ago
by:
Guest
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Tests:
Array Concat
let arr1 = [1,2,3]; let arr2 = [4,5,6]; let arr3 = arr1.concat(arr2);
Spread Operator
let arr1 = [1,2,3]; let arr2 = [4,5,6]; let arr3 = [...arr1, ...arr2];
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Array Concat
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 break down the provided benchmark and explain what is being tested, compared, and the pros and cons of different approaches. **What is being tested?** The benchmark is testing two ways to create a new array by combining two existing arrays: `concat` and the spread operator (`...`). The test cases use the following code: * `Array Concat`: `let arr1 = [1,2,3]; let arr2 = [4,5,6]; let arr3 = arr1.concat(arr2);` * `Spread Operator`: `let arr1 = [1,2,3]; let arr2 = [4,5,6]; let arr3 = [...arr1, ...arr2];` **What options are compared?** The two options being compared are: 1. **`concat()`**: A method on the Array prototype that creates a new array by concatenating the elements of one or more arrays. 2. **Spread Operator (`...`)**: A syntax for creating a new array by spreading the elements of an existing array. **Pros and Cons:** * `concat()`: Pros: + Widely supported across different browsers and environments. + Easy to read and understand. * Cons: + Can be slower than the spread operator due to its overhead (in older browsers). + Requires calling a method on the Array prototype. * Spread Operator (`...`): Pros: + Faster execution speed compared to `concat()`. + More modern and widely adopted syntax. + Eliminates the need for an extra function call or prototype method invocation. * Cons: + May not be supported in older browsers (specifically, those that don't support ES6 features). + Can be less readable due to its new syntax. **Other considerations:** The benchmark is running on a desktop Linux environment with Chrome 68. The raw UAS string output indicates the browser's configuration and device platform. **Library usage:** There are no libraries being used in this benchmark. **Special JavaScript features or syntax:** None mentioned in the provided benchmark definition. **Other alternatives:** If you're interested in exploring other alternatives, here are a few options: 1. **`Array.prototype.push()`**: Another way to concatenate arrays by pushing elements onto the end of an array. 2. **`Array.prototype.slice()`**: A method that creates a shallow copy of an array by slicing it into a new array. These alternatives would be slower and less readable than the spread operator, but might be useful for demonstrating different concepts or scenarios. Keep in mind that this benchmark is designed to compare the performance of two specific JavaScript features (concatenation methods), rather than exploring alternative solutions.
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