blob: b69452eafaa58d6a8149b3d8d787042784bcd55b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
(let! compose (\[f g]
(\[x] (f (g x)))))
(let! id (\[a] a))
(let! mod (\[n k]
(- n (* k (/ n k)))))
(let! not (\[b]
(match b
true false
false true)))
(let! is-even (\[n]
(match (mod n 2)
0 true
1 false)))
(let! is-odd (compose not is-even))
;; map :: (a -> b) -> [a] -> [b]
(let! map (\[f lst]
(match lst
[]
[]
otherwise
(prepend (f (head lst)) (map f (tail lst))))))
; (map (+ 1) [1 2 3])
;; foldr :: (a -> b -> b) -> b -> [a] -> b
(let! foldr (\[f accumulator lst]
(match lst
[]
accumulator
otherwise
(f (head lst) (foldr f accumulator (tail lst))))))
;; filter :: (a -> Bool) -> [a] -> [a]
(let! filter (\[pred lst]
(match lst
[] []
otherwise (match (pred (head lst))
true
(prepend (head lst) (filter pred (tail lst)))
false
(filter pred (tail lst))))))
(let! reverse_ (\[v a]
(let! lazy x (head v))
(let! lazy xs (tail v))
(let! lazy xa (prepend x a))
(match v
[] a
_ (reverse_ xs xa))))
(let! reverse (\[v]
(reverse_ v [])))
(let! flow (\[fs] (foldr compose id (reverse fs))))
(let! pipe (\[x fs] ((flow fs) x)))
(let! leq? (\[a b]
(or?
(eq? a b)
(lt? a b))))
(let! rt? (compose not leq?))
(let! req? (compose not lt?))
(let! max2 (\[a b]
(match (lt? a b)
true b
false a)))
(let! max (\[vals]
(let! lazy v (head vals))
(let! vs (tail vals))
(match vs
[] v
otherwise (max2 v (max vs)))))
(let! split-by' (\[delim acc vals]
(let! lazy v (head vals))
(let! vs (tail vals))
(match vs
[] (match v
delim [(reverse acc)]
otherwise [(prepend v (reverse acc))])
otherwise (match v
delim (prepend (reverse acc) (split-by' delim [] vs))
otherwise (split-by' delim (prepend v acc) vs)))))
; split vector by delimiter
(let! split-by (\[delim vals]
(split-by' delim [] vals)))
(let! print-fmt! (\![fstr args]
(print! (fmt fstr args))))
|
