Created
December 26, 2015 00:24
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sub postfix:<!> (Int $n) { | |
fail "Not a Natural Number in Factorial" if $n < 0; | |
[*] 2..$n | |
} | |
use Test; | |
isa-ok (-1)!, Failure, "Factorial for -1 fails"; | |
ok 0! == 1, "Factorial for 0"; | |
ok 1! == 1, "Factorial for 1"; | |
ok 5! == 120, "Factorial for a larger integer"; |
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