Learn You a Haskell for Great Good! by Miran Lipovaca

Author:Miran Lipovaca
Language: eng
Format: mobi, epub, pdf
Tags: Reference:Computers
ISBN: 9781593272838
Publisher: No Starch Press
Published: 2011-04-01T00:00:00+00:00

Forget Haskell for a minute and think about how to solve the problem by hand. In the RPN calculator section, we first figured out that when calculating an expression by hand, we keep a sort of stack in our minds and then go over the expression one item at a time..

Think about how we’re going to represent our data in Haskell. For our RPN calculator, we decided to use a list of strings to represent our expression..

Figure out how to operate on that data in Haskell so that we produce a solution. For the calculator, we used a left fold to walk over the list of strings, while keeping a stack to produce a solution.

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