2.7.13.1 Map

A virtual code application in the following form causes a function with non-nil virtual code f to be applied to every item in a list.

T22

[[map]] f = ((nil,nil),((nil,f),nil))

The map mnemonic is used in silly to express applications in this form as map f. This operation is also well known to lisp users and functional programmers. The semantics is determined by these two operator properties (for non-nil f).

P24

([[map]] f) nil = nil

P25

([[map]] f) (x,y) = (f x,([[map]] f) y)

Note that the representation of lists described in Representation of Numeric and Textual Data, is assumed.

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