          | Lecture 4 - Page 11 : 34 |
| Functional Programming in Scheme Higher-order Functions |
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| Filtering | As the name indicates, the filter function is good for examining elements of a list for a certain property.
Only elements which possess the property are allowed through the filter. |
A filtering function applies a predicate (boolean function) on every element of a list.
Only elements on which the predicate returns true are returned from the filtering function. The function filter is not an essential Scheme function - but is part of the LAML general library |
 | Filtering a list with a predicate f. The resulting list is the subset of the elements which satisfy f (the elements on which f returns true). |