In osl you can use an assignment operator to set a variable to itself but modified by an operator. This allows you to compact code into a simpler format.
An example of an assignment operator is += where it adds/joins a value to the variable
variable = 10
// the variable is 10
variable += 10
// the variable is now 20
All Assignment operators
variable += number
// adds a number to the variable value
variable += string
// joins a string to the variable value
variable -= number
// subtracts a number from the variable value
variable /= number
// divides the variable value by a number
variable *= number
// multiplies the variable value by a number
variable %= number
// sets the varable value to "variable % number"
variable ^= number
// sets the varable value to "variable ^ number"
Increment/Decrement
variable ++
// increase a variable by exactly 1
variable --
// decrease a variable by exactly 1
