Overview

The provided JSON represents a benchmark test case on MeasureThat.net, which compares the performance of two approaches to create a sorted array from an existing one: using Array.prototype.slice and then sorting, versus using the new ES6 spread operator (...) with sorting.

Options Compared

There are only two options compared:

1. Array.prototype.slice: This method creates a shallow copy of the original array and returns it.
2. Spread Operator (...): This syntax creates a new array from an existing array by spreading its elements into a new array.

Pros and Cons of Each Approach

• Array.prototype.slice:
  • Pros:
    • Widely supported in older browsers
    • More predictable performance, as the slice() method always returns a new array with the same length
  • Cons:
    • Can be slower than the spread operator for large arrays
    • Requires additional memory to store the intermediate result
• Spread Operator (...):
  • Pros:
    • More concise and readable code
    • Faster performance, as it avoids creating an intermediate array
  • Cons:
    • Less supported in older browsers (Chrome 126 is one of the few browsers that supports it)
    • Can be slower for very large arrays due to the overhead of JavaScript's dynamic typing

Library

None of the provided test cases use a library. However, MeasureThat.net itself uses JavaScript as its programming language.

Special JS Feature/Syntax

The spread operator (...) is a relatively new feature introduced in ECMAScript 2015 (ES6). It allows creating a new array from an existing array by spreading its elements into a new array.

Other Alternatives

In addition to the spread operator, other alternatives for creating a sorted array could include:

• Using Array.prototype.concat() and then sorting: var params = [ "hello", true, 7, 3, 4 ]; var other = params.concat().sort();
• Using Array.prototype.reduce() and then sorting: var params = [ "hello", true, 7, 3, 4 ]; var other = params.reduce((a, b) => a + ', ' + b).split(',').slice(1).sort();

However, these alternatives are not included in the provided benchmark test case.