Let's dive into the world of JavaScript microbenchmarks!

What is tested?

The provided JSON represents a benchmark test case that compares two approaches to add an element to an array: the traditional push() method and the new ES6 spread operator (...). The test case measures which approach is faster in terms of executions per second.

Options compared

There are only two options being compared:

1. Traditional push() method: This is the classic way to add an element to an array using the push() method.
2. New ES6 spread operator (...): This is a new syntax introduced in ECMAScript 2015 (ES6) that allows for more concise and expressive array creation.

Pros and Cons of each approach

1. Traditional push() method
   • Pros:
     • Wide browser support (has been around since JavaScript 1.0)
     • Well-established and widely understood syntax
   • Cons:
     • Can be slower due to the overhead of calling a method on an array
2. New ES6 spread operator (...)
   • Pros:
     • More concise and expressive syntax, making it easier to create arrays
     • Potential performance benefits due to optimized JavaScript engines
   • Cons:
     • Newer syntax may take time for some browsers to fully support

Library used

None, this test case only uses built-in JavaScript features.

Special JS feature or syntax

The ES6 spread operator (...) is a relatively new syntax introduced in ECMAScript 2015 (ES6). It allows for more concise and expressive array creation by spreading elements of an existing array into a new array.

Benchmark preparation code

There is no provided script preparation code, but the test cases themselves demonstrate how to use both approaches:

// Traditional push()
var params = [ "hello", true, 7 ];
var other = params.push(1);

// New ES6 spread operator
var params = [ "hello", true, 7 ];
var other = [...params, 1];

Other alternatives

There may be other ways to add an element to an array, such as using concat() or creating a new array with Array.prototype.slice(). However, these approaches are not being compared in this benchmark test case.

Overall, this benchmark test case provides a simple and straightforward way to compare the performance of two different array manipulation methods: traditional push() vs. new ES6 spread operator (...).