Benchmark Overview

The provided benchmark measures the performance of three different ways to initialize an array in JavaScript: using the new Array() constructor, new Array(times) constructor, and an array literal ([]).

Test Cases

There are three test cases:

1. Array Constructor: This test case uses the new Array() constructor to create an array and then pushes 1337 into it times number of times.
2. Array Size Constructor: This test case uses the new Array(times) constructor to create an array with a specific size (times) and then pushes 1337 into it times number of times.
3. Array Literal: This test case uses an array literal ([]) to create an empty array and then pushes 1337 into it times number of times.

Library Usage

None of the test cases use any external libraries.

Special JavaScript Features/Syntax

None of the test cases utilize any special JavaScript features or syntax. They only rely on standard JavaScript features and syntax.

Benchmark Comparison

The benchmark compares the performance of these three methods:

• Array Constructor: Creates an array using new Array() and then pushes elements into it.
  • Pros: Easy to read and maintain, concise code.
  • Cons: Can lead to slower performance due to the creation overhead of the new array object.
• Array Size Constructor: Creates an array using new Array(times) and then pushes elements into it.
  • Pros: More efficient than new Array() since it creates an array with a specific size, reducing the overhead.
  • Cons: Requires knowing the exact size of the array beforehand, which might not be always possible or desirable.
• Array Literal: Creates an empty array using [] and then pushes elements into it.
  • Pros: Very efficient since arrays created using literals are optimized for performance.
  • Cons: May lead to confusing code if the literal is too long or complex.

Benchmark Results

The latest benchmark results show that:

• The Array Literal method performs best, with an average of 1796.97998046875 executions per second on a Desktop (Mac OS X 10.15.7) running Chrome 119.
• The Array Size Constructor method performs worst, with an average of 1233.767578125 executions per second on the same platform and browser.

These results suggest that using an array literal is generally the most efficient way to initialize an array in JavaScript.

Other Alternatives

If you need to create a large array or an array with a specific size, you might consider using other alternatives:

• Array.from(): Creates an array from an iterable source. While it's not directly comparable to the above methods, it can be a more efficient way to create arrays in certain scenarios.
• Sparse Arrays: Create a sparse array by using new Array(times) with a specific length and then filling some elements with values.
• Typed Arrays: Use typed arrays (e.g., Int32Array) for numerical computations or other types of data that require efficient memory access.

Keep in mind that these alternatives might not be as straightforward to use as the original methods, but they can provide additional options depending on your specific use case.