Functions Index :: S :: Self
Returns its argument unchanged. 
x = 2.3
y = Self(x) # y == 2.3
s = "a test string"
z = Self(s) # y == "a test string"
: The function is provided as a building block of more complex functions, particularly for operations on arrays. See the documentation of the array package and the ArrayOpFunc, ArrayOpArrayFunc and ArraySum functions.