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### 9.3.2 Selection and searching in collection

Generic function: find pred coll
Applies pred for each element of a collection coll until pred returns a true value. Returns the element on which pred returned a true value, or `#f` if no element satisfies pred.

If coll is a sequence, it is guaranteed that pred is applied in order. Otherwise the order of application is undefined. Returns a list of elements of collection coll that satisfies the predicate pred. If the collection is a sequence, the order is preserved in the result.

 ```(filter char-upper-case? "Hello, World") => (#\H #\W) (filter even? '#(1 2 3 4)) => (2 4) ```

Generic function: filter-to class pred coll
Same as `filter`, but the result is returned as a collection of class class.

 ```(filter-to even? '#(1 2 3 4)) => #(2 4) (filter-to char-upper-case? "Hello, World") => "HW" ```

Generic function: remove pred coll
Returns a list of elements of collection coll that does not satisfy the predicate pred. If the collection is a sequence, the order is preserved in the result.

 ```(remove char-upper-case? "Hello, World") => (#\e #\l #\l #\o #\, #\space #\o #\r #\l #\d) (remove even? '#(1 2 3 4)) => (1 3) ```

Generic function: remove-to class pred coll
Same as `remove`, but the result is returned as a collection of class class.

 ```(remove-to even? '#(1 2 3 4)) => #(1 3) (remove-to char-upper-case? "Hello, World") => "ello, orld" ```

Generic function: partition pred coll
Does `filter` and `remove` the same time. Returns two lists, the first consists of elements of the collection coll that satisfies the predicate pred, and the second consists of elements that doesn't.

 ```(partition char-upper-case? "PuPu") => (#\P #\P) and (#\u #\u) (partition even? '#(1 2 3 4)) => (2 4) and (1 3) ```

Generic function: partition-to class pred coll
Same as `partition`, except the results are returned in the collections of class class.

 ```(partition-to char-upper-case? "PuPu") => "PP" and "uu" (partition-to even? '#(1 2 3 4)) => #(2 4) and #(1 3) ```

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This document was generated by Ken Dickey on November, 28 2002 using texi2html