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(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
5 years ago
by:
Registered User
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Tests:
Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = params.concat('hi');
spread operator
var params = [ "hello", true, 7 ] var other = [ ...params, 'hi' ]
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Suite status:
<idle, ready to run>
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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 dive into the explanation of what's tested in this benchmark, and the pros and cons of each approach. **What is being tested?** The benchmark compares two approaches for concatenating an array: the traditional `concat()` method and the ES6 spread operator (`...`). **Options compared:** 1. **Traditional `concat()` method**: This method creates a new array by copying all elements from the original array and then adding the new element(s) to it. 2. **ES6 spread operator (`...`)**: This operator is used to expand an iterable (such as an array or object) into separate arguments. **Pros and Cons of each approach:** 1. **Traditional `concat()` method**: * Pros: widely supported, relatively simple implementation. * Cons: creates a new array, which can lead to memory allocation overhead. 2. **ES6 spread operator (`...`)**: * Pros: efficient, concise syntax, and avoids creating a new array. * Cons: requires JavaScript version 7+ support, may not work in older browsers. **Library and purpose** In the first test case, the benchmark uses the `concat()` method from the `Array.prototype`. This is a built-in JavaScript method that concatenates an array with another iterable or value. **Special JS feature/syntax** There's no special JavaScript feature or syntax used in this benchmark. The focus is solely on comparing two approaches for concatenating an array. **Other alternatives** If you were to test similar benchmarks, you might consider adding additional approaches, such as: * Using `Array.push()` and passing the new element(s) separately * Using `slice()` and concatenating the resulting arrays * Using `Set` and `add()` methods (for more complex data structures) Keep in mind that these alternatives may have different performance characteristics or syntax requirements. **Benchmark preparation code** The benchmark preparation code is not provided, but based on the test cases, it appears to be minimal, with only a single line of code defining the input array (`var params = [ "hello", true, 7 ];`) and then using either `concat()` or the spread operator to create the concatenated array. **Latest benchmark result** The latest benchmark result shows that the ES6 spread operator outperforms the traditional `concat()` method, with Chrome 84 executing the test case at a rate of 3985629 executions per second.
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