Packages (intro)

Programmer fred

(defpackage :fred (:export hello))

(in-package :fred)

(defun hello ()

(print "hello, fred"))

Programmer barney

(defpackage :barney (:export hello))

(in-package :barney)

(defun hello (x)

(format t "Hello, barney and ~a~%" x))

Both programmers define a function named hello.

Packages avoid clash.

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