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Array.prototype.concat vs spread operator [e]
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
2 years ago
by:
Guest
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Tests:
Array.prototype.concat
var a1 = [ "hello", true, 7 ]; var a2 = [ 1, 2 ]; var other = a1.concat(a2);
spread operator
var a1 = [ "hello", true, 7 ]; var a2 = [ 1, 2 ]; var other = [ ...a1, ...a2 ]
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Suite status:
<idle, ready to run>
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Test case name
Result
Array.prototype.concat
spread operator
Fastest:
N/A
Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks! **What is being tested?** The provided JSON represents two individual test cases that compare the performance of two approaches: 1. **Array.prototype.concat()**: This is a traditional method for concatenating arrays in JavaScript. It creates a new array by copying elements from one or more source arrays. 2. **Spread Operator (`...`)**: The spread operator is a feature introduced in ES6 that allows you to create a new array by spreading the elements of an existing array. **Options compared** The benchmark compares the performance of these two approaches: * **Array.prototype.concat()**: This method creates a new array and copies all elements from both arrays into it. * **Spread Operator (`...`)**: This operator creates a new array and copies elements from both arrays into it without modifying the original arrays. **Pros and Cons** * **Array.prototype.concat()**: * Pros: * More readable code when concatenating multiple arrays * Can be more efficient for large datasets if the spread operator is not optimized * Cons: * Creates a new array, which can lead to increased memory usage and slower performance for large datasets * **Spread Operator (`...`)**: * Pros: * More concise code and easier to read * Optimized for modern JavaScript engines, making it faster than traditional concatenation methods * Cons: * May lead to unexpected behavior or errors if not used correctly **Library usage** There is no specific library mentioned in the benchmark. However, the use of `var` and `console.log` statements implies that the script is running in a browser environment. **Special JS features/syntax** The benchmark uses ES6 syntax (e.g., spread operator) which is supported by most modern JavaScript engines. The use of `var` and `console.log` statements suggests that the script is running in a browser environment, where these variables are accessible. **Other alternatives** * **Array.prototype.push()**: Instead of concatenating arrays using `concat()` or the spread operator, you can use `push()` to add elements to an existing array. However, this approach does not create a new array and modifies the original one. * **Array.from()**: This method creates a new array from an iterable source, such as another array. While it is different from the spread operator, it shares similar goals. In summary, the benchmark compares two approaches for concatenating arrays in JavaScript: traditional `concat()` and modern spread operator. The results indicate that the spread operator offers better performance, making it a preferred choice for modern web development.
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