Syntax

rV1, rV2,..,rVn = functionName(arg1, arg2,..,argm)

with:

rV1, rV2,..,rVn: return values 1..n

arg1, arg2,..,argm: arguments 1..m

functionName: the name of the function

The function 'reads' the inputs (arguments), does 'something' and assigns values to its outputs, the arguments.