Benchmark Explanation

The provided benchmark is designed to measure the performance difference between three approaches for manipulating arrays in JavaScript: slice, splice, and shift. The benchmark consists of two test cases:

1. slice: Creates a copy of the array using the slice() method.
2. splice: Removes elements from the end of the array using the splice() method.

The benchmark generates an array with 100,000 elements and then performs one million pushes to this array. The performance difference between these three approaches is then measured in terms of execution time per second.

Comparison Options

There are two main comparison options:

• slice: Creates a new array by copying the original array using slice().
  • Pros: Easy to understand, creates a new array without modifying the original.
  • Cons: Can be slower than other methods due to the overhead of creating a new array.
• splice: Modifies the original array in place by removing elements from the end.
  • Pros: Can be faster than slice since it modifies the original array without creating a copy.
  • Cons: Modifies the original array, which can lead to unexpected behavior if not handled carefully.

Other Considerations

In addition to these two options, there is another approach that uses the shift() method:

• shift: Removes elements from the beginning of the array without creating a new copy.
  • Pros: Can be faster than slice since it modifies the original array without creating a copy.
  • Cons: Requires care when handling edge cases, such as empty arrays.

Library and Special JS Features

There is no library used in this benchmark. However, the benchmark does utilize some special JavaScript features:

• Array methods: The benchmark uses slice(), splice(), and shift() methods to manipulate arrays.
• Looping constructs: The benchmark uses a for loop to push elements onto the array.

Benchmark Result

The latest benchmark result shows that the Chrome 119 browser with a Desktop platform and Mac OS X 10.15.7 operating system achieved:

• splice: Execution time of approximately 9,019,286 executions per second.
• slice: Execution time of approximately 383 executions per second.

These results indicate that the splice() method is significantly faster than the slice() method in this benchmark.