Lecture 20 Objectives

At the end of today's class you should

KNOW:

That functions are values and can be passed as arguments to other functions
That filter can be used whenever you want to extract elements from a list according to some predicate
That filter provides a compact way to write certain functions over lists

BE ABLE TO:

Use filter to write functions over lists.

Sample Exam Question:

A database of college students staying in residence halls is made up of a list of structs with the following format:

;; a student is a struct
;; (make-student string symbol number string)
(define-struct student(name gender age id))

Using filter, write a function list-all-females that consumes a list-of-student and produces a list-of-student. The list that is produced contains only the female students.