23 lines
514 B
Factor
23 lines
514 B
Factor
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USE: stack
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USE: strings
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USE: math
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USE: combinators
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USE: test
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! http://inferno.bell-labs.com/cm/cs/who/bwk/interps/pap.html
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: string-step ( n str -- )
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2dup str-length > [
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dup <% "123" % % "456" % % "789" % %>
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dup dup str-length 2 /i 0 transp substring
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swap dup str-length 2 /i succ 1 transp substring cat2
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string-step
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] [
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2drop
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] ifte ;
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: string-benchmark ( n -- )
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"abcdef" 10 [ 2dup string-step ] times 2drop ;
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[ ] [ 1000000 string-benchmark ] unit-test
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