application/octet-stream
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1.55 KB
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63 lines
[def PI 3.14159]
[def π 3.14159]
[defmacro ++ [i]
"Increment I by 1 and store the result in I"
`[set! ~i [+ 1 ~i]]
]
[defmacro -- [i]
"Decrement I by 1 and store the result in I"
`[set! ~i [+ -1 ~i]]
]
[defun +x [α]
"Return a function that adds α to it's argument, useful for mapping"
[λ [β] [+ α β]]
]
[defun >> [val amount]
"Shifts VAL by AMOUNT bits to the right"
[ash val [- amount]]
]
[def min [let*
[def iter [λ [a l]
[cond [[nil? l] a]
[[< a [car l]] [iter a [cdr l]]]
[#t [iter [car l] [cdr l]]]
]
]]
[λ [...l]
"Returns the minimum value of its arguments"
[cond [[nil? ...l] 0]
[[nil? [cdr ...l]] [car ...l]]
[#t [iter [car ...l] [cdr ...l]]]
]
]
]]
[def max [let*
[def iter [λ [a l]
[cond [[nil? l] a]
[[> a [car l]] [iter a [cdr l]]]
[#t [iter [car l] [cdr l]]]
]
]]
[λ [...l]
"Returns the maximum value of its arguments"
[cond [[nil? ...l] 0]
[[nil? [cdr ...l]] [car ...l]]
[#t [iter [car ...l] [cdr ...l]]]
]
]
]]
[defun fib [i]
"Terribly inefficient, but, useful for testing the GC"
[if [< i 2]
i
[+ [fib [- i 2]] [fib [- i 1]]]]
]
