Overview of the Benchmark

The provided benchmark measures the performance of three different methods for adding an element to an array in JavaScript: push, concat, and spread syntax (...). The test case uses two arrays, arr1 and arr2, with a total of 7 elements.

Options Compared

• Push: Uses the push() method to add an element to the end of the array.
• Concat: Uses the concat() method to concatenate two arrays and return a new array.
• Spread Syntax: Uses the spread operator (...) to create a new array by spreading the elements of the original array and adding the new element.

Pros and Cons

• Push:
  • Pros: Fast, efficient, and widely supported. It modifies the original array in place.
  • Cons: Can be slower than other methods for large arrays or when dealing with sparse arrays.
• Concat:
  • Pros: Creates a new array and leaves the original array unchanged. Suitable for scenarios where immutability is desired.
  • Cons: Slower than push due to the creation of a new array, which can be costly in terms of memory allocation and garbage collection.
• Spread Syntax:
  • Pros: Fast, efficient, and easy to read. It creates a new array without modifying the original one.
  • Cons: Requires support for modern JavaScript features (ECMAScript 2018 and later) and may not work in older browsers or environments.

Library Usage

In this benchmark, no external libraries are used.

Special JS Features/Syntax

• Spread Syntax (...): This syntax was introduced in ECMAScript 2015 (ES6). It allows for creating new arrays by spreading the elements of an existing array.
• No special features/syntax: The push() and concat() methods are built-in JavaScript methods that do not require any additional libraries or syntax.

Other Alternatives

• Other alternatives to push could include using splice() with a negative index, but this is generally less efficient than push.
• For concatenating arrays, other alternatives might be using the + operator (which creates a new array by concatenating elements) or the Array.prototype.reduce() method.
• Spread syntax has several alternative ways to achieve similar results, such as using Array.from() and pushing elements onto an existing array.

Benchmark Result

The latest benchmark result shows that:

• Push: 4413375.5 executions per second
• Concat: 1563.228759765625 executions per second ( significantly slower than push)
• Spread Syntax: 2.609727144241333 executions per second (slightly faster than concat, but still slower than push)

Keep in mind that these results are specific to the Chrome browser and may vary depending on other factors such as the size of the arrays, device performance, and JavaScript engine optimizations.