|Parameters||b1 ... bn, n Boolean values|
|Purpose||Determines if any of the values is true.|
|Produces||A truth value: true (|
|Preconditions||All the parameters are Boolean values (unverified).|
> (or #t #t #t) #t > (or #f #f #f) #f > (or (< 1 2) (< 2 3)) #t > (or (odd? 1) (odd? 3) (odd? 5) (odd? 6)) #t > (or) #f > (or (even? 1) (even? 3) (even? 4) (even? 5)) #t
|Parameters||exp1 ... expn, n expressions|
|Purpose||Evaluates expressions one-by-one until it reaches the end or something that is not false.|
|Produces||The value of one of the expressions.
Returns false (|
|Postconditions||Evalutes each of the expressions up to (and including) the first one that fails to returns false. If all of the expressions return false, evaluates all of the expressions.|
> (or "hello" "goodbye") "hello" > (or (< 3 2) (< 1 0) 'failed) failed
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