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Array.concat vs Spread Operator in 100 number
(version: 0)
Compare the new ES6 spread operator with the standard concat() method
Comparing performance of:
Spread operator vs Concat
Created:
3 years ago
by:
Guest
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Tests:
Spread operator
const a = Array.apply(null, Array(100)) .map(function (y, i) { return i; }) const b = Array.apply(null, Array(100)) .map(function (y, i) { return i; }); let c = [ ...a, ...b ];
Concat
const a = Array.apply(null, Array(100)) .map(function (y, i) { return i; }) const b = Array.apply(null, Array(100)) .map(function (y, i) { return i; }); let c = a.concat(b);
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Spread operator
Concat
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the provided benchmark. **Overview** MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The goal of this benchmark is to compare two methods for concatenating arrays: the old `Array.concat()` method and the new ES6 spread operator (`...`). **What is being tested?** The benchmark tests the performance of the following approaches: 1. **Old `Array.concat()` method**: This method creates a new array by concatenating two arrays using the `concat()` function. 2. **New ES6 spread operator (`...`)**: This method uses the spread operator to concatenate two arrays. **Options compared** The benchmark compares the performance of these two approaches: * Old `Array.concat()` method + Pros: - Well-established and widely supported - Easy to understand and use + Cons: - Creates a new array, which can be memory-intensive for large datasets - May have performance overhead due to the creation of a new object * New ES6 spread operator (`...`) + Pros: - Creates a new array with minimal overhead - More efficient than `Array.concat()` for large datasets + Cons: - Less well-established and less widely supported (older browsers may not support it) - May be less intuitive to use for some developers **Library usage** There is no explicit library usage in the benchmark definition. However, the spread operator relies on the `Array.prototype.slice()` method internally. **Special JS feature or syntax** The benchmark uses a special JavaScript feature: the spread operator (`...`). This was introduced in ECMAScript 2015 (ES6) and allows for concise array concatenation using the syntax `[ ...array1, ...array2 ]`. **Other alternatives** If you want to test alternative approaches, here are some options: * **`Array.prototype.push()`**: This method appends elements to an array one by one. It's not as efficient as `Array.concat()` or the spread operator for large datasets. * **`Array.prototype.splice()`**: This method removes elements from an array and replaces them with new values. It's not suitable for concatenating arrays. Overall, the benchmark provides a good comparison between two widely used methods in JavaScript: the old `Array.concat()` method and the new ES6 spread operator.
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