removeDuplicates.js contains a function to remove duplicates from a list, and a test that proves it can handle 100,000 items in under 1 second. To run the script, place the script in a directory and run "node removeDuplicatesTest.js" in command line inside the directory.

Script prints "Removing duplicates took xx ms" if it takes less than a second.

If script takes more than a second to run, It throws an error with execution time details.

" throw new Error(Removing duplicates took ${duration}ms); ^ Error: Removing duplicates took 1020ms"

Note: This script was tested using node v12.18.3.