'if' as a _function_, in Scheme and Python
Andy Gaynor
silver at mail.webspan.net
Thu Aug 19 19:12:54 EDT 1999
Consider:
(define (boolean->integer x)
(if x 1 0))
(define (if-function condition consequent-thunk alternate-thunk)
((vector-ref `#(,alternate-thunk ,consequent-thunk)
(boolean->integer condition))))
That is, `if' can well be thought of as syntactic sugar for a particularly
easy-to-optimize `case' expression.
Regards, [Ag] Andy Gaynor silver at mail.webspan.net
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