ISBN 91-7197-611-6 ISSN 0346-718X http://www.cs.chalmers.se/~hallgren/Thesis/ Department of Computing Science Göteborg 1998 The main result of this thesis is a method for writing programs with graphical user interfaces in purely functional languages. The method is based on a new abstraction called the fudget. The method makes good use of key abstraction powers of functional languages, such as high
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