Addition is a mathematical operation that represents combining collections of objects together into a larger collection
Subtraction is a mathematical operation that represents the removal of an object from a collection.
"Addition and subtraction is worse as these have to be done in sequence of two operations and the second operation requires the first to have completed - this is not the case if the compiler is just producing two add operations on independent data"
from question "What is the performance impact of using int64_t instead of int32_t on 32-bit systems?"
|Assignment lower procedure||
"Addition subtraction assignment has lower procedure than simply add operation"
from question "Can't understand x *= y+1 output"