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Array: spread operatorzxc vs push
(version: 0)
Comparing performance of:
spread operator vs push function
Created:
6 years ago
by:
Guest
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Tests:
spread operator
var arr = [1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3]; arr = [...arr, 4];
push function
var arr = [1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3]; arr.push(4);
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Test case name
Result
spread operator
push function
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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. The benchmark is designed to compare two approaches for adding an element to an array: using the spread operator (`arr.push(4)` vs `arr = [...arr, 4]`). **Options compared:** 1. **Push function**: The traditional way of adding an element to an array by calling the `push()` method. 2. **Spread operator**: A newer approach introduced in ECMAScript 2015 (ES6) that uses the syntax `[...array, element]` to create a new array with the element appended. **Pros and cons:** **Push function:** Pros: * Wide compatibility across older browsers * Easy to read and understand Cons: * Creates a new reference to the original array, which can lead to unexpected behavior if not handled properly. * Can be slower due to the creation of a new array object. **Spread operator:** Pros: * More concise and expressive syntax * Does not create a new reference to the original array (only creates a copy). Cons: * May not work in older browsers that do not support ES6+ features. * Can be slightly slower due to the creation of a new array object. In general, the spread operator is considered a better approach for adding elements to an array, as it provides a more concise and readable syntax while minimizing the creation of new objects. However, if you need to support older browsers or have specific use cases where the push function is preferred, that's perfectly fine too! As for libraries used in this benchmark, none are explicitly mentioned. Regarding special JavaScript features or syntax, only ES6+ features like the spread operator are used in this benchmark. Now, let's talk about alternative approaches: **Alternative approaches:** 1. **Array.prototype.push.call()**: This method uses `call()` to call the `push()` method on an array object, passing the array as the first argument. While it achieves the same result as using `arr = [...arr, 4]`, it's less concise and readable. 2. **Array.prototype.splice() with [start, end, value]**: You can also use `splice()` to add a single element to an array, but this approach is less efficient and more complex than the spread operator or push function. Overall, MeasureThat.net provides a useful tool for comparing different approaches to adding elements to arrays in JavaScript. By understanding the pros and cons of each approach, you can make informed decisions about which method to use in your own code.
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