This is a literate Haskell page: you can load it directly into ghci by following these steps. Haskell uses an evaluation strategy known as lazy evaluation. The basic idea is that an expression is not ...

The book I'm reading says that the "read" function can be used to parse a string representing a value of a particular type into that value. That's all well and good, but does it actually work on ...

To evaluate a postfix expression, you need a stream of tokens and a stack that holds tokens. For example, to evaluate 2 3 +, you read in the tokens one at a time, from left to right, and apply the ...