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Array concat vs spread operator oaskdo
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method and push
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
2 years ago
by:
Guest
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Tests:
Array.prototype.concat
var params1 = [ "hello", true, 7 ]; var params2 = [ "hello", true, 7 ]; var params3 = [ "hello", true, 7 ]; var other = [].concat(params1,params2,params3);
spread operator
var params1 = [ "hello", true, 7 ]; var params2 = [ "hello", true, 7 ]; var params3 = [ "hello", true, 7 ]; var other = [...params1, ...params2, ...params3]
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Test case name
Result
Array.prototype.concat
spread operator
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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's being tested, compared, and some pros/cons of different approaches. **Overview** The MeasureThat.net website allows users to create and run JavaScript microbenchmarks. The provided benchmark compares two methods for concatenating arrays: the traditional `Array.prototype.concat()` method and the new ES6 spread operator (`...`). **What's being tested?** Two test cases are defined: 1. **Array.prototype.concat**: This test case creates three identical arrays (`params1`, `params2`, and `params3`) containing different types of values (strings, boolean, and number) and then concatenates these arrays using the `concat()` method. 2. **Spread operator**: This test case also creates three identical arrays as above but uses the spread operator (`...`) to concatenate them. **Options compared** The two approaches being compared are: * **Traditional concat() method**: This method involves creating a new array by calling `Array.prototype.concat()` and passing the concatenated elements. * **Spread operator (ES6)**: This method involves using the spread operator (`...`) to create a new array by spreading the existing arrays. **Pros/Cons of different approaches** **Traditional concat() method** Pros: * Widely supported across browsers * Easy to implement and understand Cons: * Creates a new array, which can be memory-intensive for large inputs * May have performance implications due to the overhead of creating a new array **Spread operator (ES6)** Pros: * More concise and readable than traditional concat() * Can lead to better performance since it avoids the overhead of creating a new array Cons: * Requires modern JavaScript versions to support (ES6+) * May not be supported in older browsers or environments **Other considerations** The benchmark results indicate that the spread operator (`...`) outperforms the traditional `concat()` method for this specific test case. However, it's essential to note that performance differences may vary depending on the input size, JavaScript version, and browser. If you were to implement this benchmark yourself, you could also consider adding additional variables or conditions to simulate real-world scenarios, such as: * Larger input arrays * Different types of data (e.g., objects, dates) * Edge cases (e.g., empty arrays, null values) **Library/Utility** None are explicitly mentioned in the provided code. **Special JS features/syntax** The spread operator (`...`) is a modern JavaScript feature introduced in ES6. It's used to create a new array by spreading the elements of an existing array or other iterable. The syntax `var other = [...params1, ...params2, ...params3];` is using this feature to concatenate the arrays. If you're interested in exploring more microbenchmarks or learning about different JavaScript performance optimization techniques, I recommend checking out MeasureThat.net's documentation and resources!
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