Local Scoping

OSL uses declarations to create local variables inside functions and command blocks. Use a type keyword such as any, string, number, boolean, array, object, or auto before the variable name.

def counter() (
  any count = 0
  count += 1
  return count
)

log counter()
// 1

Shadowing Globals

A local declaration can use the same name as a global variable. Inside the function, the local value is used first; outside the function, the global value is unchanged.

any message = "global"

def showMessage() (
  any message = "local"
  log message
)

showMessage()
log message
// local
// global

Reassignment

After a local variable has been declared, reassign it without repeating the type.

def total() (
  number value = 1
  value += 4
  return value
)

log total()
// 5

The old originOS local keyword is legacy syntax. Current OSL does not use local or a this object for function-local variables.