Check if a number is in the range of numbers. ie. is 5 between 1 and 10/ in range of 1 to 10

new default array

Test forEach (findIndex) vs forEach (include)

Test the performance of Array.find vs. Map.get, with various array sizes, and with/without conversion from array to map

Testing the results for the fastest approach of shallow copying an array in JavaScript (concat, slice, for loop, and while loop).