var params = [ "hello", true, 7 ];var params2 = [ "hello", true, 7 ];var other = params.concat(params2);var params = [ "hello", true, 7 ];var params2 = [ "hello", true, 7 ];var other = [ params, params2 ]var params = [ "hello", true, 7 ];var params2 = [ "hello", true, 7 ];var other = [params, params2].flat()--enable-precise-memory-info flag.
| Test case name | Result |
|---|---|
| Array.prototype.concat | |
| spread operator | |
| Array.prototype.flat |
| Test name | Executions per second |
|---|---|
| Array.prototype.concat | 6041433.0 Ops/sec |
| spread operator | 23887200.0 Ops/sec |
| Array.prototype.flat | 1143756.4 Ops/sec |
Let's break down the provided JSON and explain what is tested in each test case.
Benchmark Definition
The benchmark compares three approaches to concatenate two arrays in JavaScript:
Array.prototype.concat()...)Array.prototype.flat() (specifically, the .flat(Infinity) method)These three approaches are compared for their performance, efficiency, and consistency.
Pros and Cons of Each Approach
Array.prototype.concat(): This is a traditional method that creates a new array by concatenating two arrays using the spread operator. It can be slower than other methods because it involves creating a new array object....): The spread operator allows you to create a new array by spreading elements from existing arrays. It is generally faster than concat() because it avoids creating a new array object.Array.prototype.flat() (.flat(Infinity)): This method flattens an array of arrays into a single array, removing any nested arrays. The .flat(Infinity) method ensures that the original array structure is preserved. It can be slower than other methods because it involves recursive calls.Library and Purpose
None of the test cases use any external libraries or frameworks.
Special JS Feature or Syntax
The spread operator (...) is a new feature introduced in ECMAScript 2015 (ES6). It allows you to create a new array by spreading elements from existing arrays. This syntax is supported in modern browsers and JavaScript engines.
Other Alternatives
In addition to the three approaches tested, other alternatives for concatenating arrays include:
Array.prototype.push(): You can push all elements from one array into another using push(). However, this method modifies the original array.Array.prototype.set(): Some older browsers and JavaScript engines support set() as an alternative to concat(). However, this method is not widely supported.In summary, the benchmark tests three approaches for concatenating arrays in JavaScript: Array.prototype.concat(), the spread operator (...), and Array.prototype.flat() (.flat(Infinity)`). Each approach has its pros and cons, and the test results provide insight into their relative performance on mobile devices running Chrome browser.
