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week4 tweaks
[lambda.git]
/
assignment_3_evaluator.mdwn
diff --git
a/assignment_3_evaluator.mdwn
b/assignment_3_evaluator.mdwn
index
c0af5d0
..
496003d
100644
(file)
--- a/
assignment_3_evaluator.mdwn
+++ b/
assignment_3_evaluator.mdwn
@@
-6,13
+6,13
@@
let true = \x y. x in
let false = \x y. y in
let and = \l r. l (r true false) false in
let make\_pair = \f s g. g f s in
let false = \x y. y in
let and = \l r. l (r true false) false in
let make\_pair = \f s g. g f s in
-let fst = true in
-let snd = false in
+let
get\_
fst = true in
+let
get\_
snd = false in
let empty = make\_pair true junk in
let empty = make\_pair true junk in
-let isempty = \x. x fst in
+let isempty = \x. x
get\_
fst in
let make\_list = \h t. make\_pair false (make\_pair h t) in
let make\_list = \h t. make\_pair false (make\_pair h t) in
-let head = \l. isempty l err (l
snd
fst) in
-let tail = \l. isempty l err (l
snd
snd) in
+let head = \l. isempty l err (l
get\_snd get\_
fst) in
+let tail = \l. isempty l err (l
get\_snd get\_
snd) in
;
; a list of numbers to experiment on
let mylist = make\_list 1 (make\_list 2 (make\_list 3 empty)) in
;
; a list of numbers to experiment on
let mylist = make\_list 1 (make\_list 2 (make\_list 3 empty)) in
@@
-32,6
+32,8
@@
let length = Y (\length l. isempty l 0 (succ (length (tail l)))) in
;
; synonyms
let makePair = make\_pair in
;
; synonyms
let makePair = make\_pair in
+let fst = get\_fst in
+let snd = get\_snd in
let nil = empty in
let isNil = isempty in
let makeList = make\_list in
let nil = empty in
let isNil = isempty in
let makeList = make\_list in