Created
November 23, 2012 03:01
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keep (scheme)
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| (define (keep pred stuff) | |
| (cond | |
| ((word? stuff) | |
| (if (empty? stuff) | |
| "" | |
| (if (pred (first stuff)) | |
| (word (first stuff) (keep pred (bf stuff))) | |
| (keep pred (bf stuff))))) | |
| (else | |
| (if (empty? stuff) | |
| '() | |
| (if (pred (first stuff)) | |
| (se (first stuff) (keep pred (bf stuff))) | |
| (keep pred (bf stuff))))))) |
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