* Optimizations with private, params, and isEqualType
* Fixed tab being used instead of space
* Fixed tabs inserted by notepad++
* More usage of new private syntax and params
- changed a few checks for an array being empty to `_arr isEqualTo []`
rather than `count _arr == 0`
- added more uses of `private` on the same line as the variable is
declared
- added more uses of params to assign variables passed as parameters
- removed unnecessary parentheses
- removed several unnecessary variable declarations with private array
syntax
* clean up and formatting
Previously when iterating over an array and modifying the same array via deletion of the current index, incorrect means was used to account for the change in index resulting in any further deletions being applied to the wrong elements.
This solution does not require duplication of the array or the use of external variables to track the number of deleted elements. We simply lower the `_forEachIndex` by 1 whenever an element is removed.
