More Array Tools

[HeroEyad]

adds a handful of util functions to ArrayTools that the standard Array api doesn't cover. (or atleast that i know of)

what did i add?

• shuffle: fisher yates in place shuffle
• last: returns the last element or null if empty (instead of array[array.length - 1])
• unique: removes the duplicate values in place
• union: merges two arrays without any duplicates into a new array
• swap: swaps two elements by index in place
• groupBy : groups elements by a key function into a Map
• chunk : splits an array into subarrays of a fixed size

please note

shuffle internally uses swap to avoid duplicating the swap logic. unique and shuffle change in place to stay consistent with the existing clear function. union returns a new array since there's no clear target to change into.