Download e-book for kindle: Haskell 98 language and libraries The revised report by Simon Peyton Jones

By Simon Peyton Jones

Haskell is the world's best lazy useful programming language and is usual in instructing, study, and purposes. The language maintains to enhance quickly, yet in 1998 the programming group made up our minds to trap a strong picture of the language via introducing Haskell ninety eight. This publication constitutes the agreed definition of Haskell ninety eight, the language itself in addition to its helping libraries, and will be a typical reference paintings for a person focused on study, educating, or purposes. All Haskell compilers aid Haskell ninety eight, so professioanls and educators have a sturdy base for his or her paintings.

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May be instantiated at types A value of type ✆ ✘ ✫ ✂ holds. 2. USER-DEFINED DATATYPES 43 double x = x + x ✂ ✂ ✂ ✂ ✩ The most general type of double is ✆ ✫ Num . double may be applied to values ✂ of type Int (instantiating to Int), since Num Int holds, because Int is an instance of the class Num. However, double may not normally be applied to values of type Char, because Char is not normally an instance of class Num. The user may choose to declare such an instance, in which case double may indeed be applied to a Char.

It is as if an identifier not used elsewhere were put in its place. 2 Informal Semantics of Pattern Matching Patterns are matched against values. e. return ). Pattern matching proceeds from left to right, and outside to inside, according to the following rules: 1. Matching the pattern ✌ ✂ ☎ against a value ✌ always succeeds and binds ✌ ✂ ☎ to ✌ . CHAPTER 3. EXPRESSIONS 32 ✂★✁✄✂ ✂★✁✄✂ ✞ against a value ✌ always succeeds. The free variables in ✞ are 2. Matching the pattern ˜ ✂✞✁✄✂ bound to the appropriate values if matching ✞ against ✌ would otherwise succeed, and to ✂✞✁✄✂ ✞ against ✌ fails or diverges.

The free variables in ✞ are 2. Matching the pattern ˜ ✂✞✁✄✂ bound to the appropriate values if matching ✞ against ✌ would otherwise succeed, and to ✂✞✁✄✂ ✞ against ✌ fails or diverges. ) if matching ✂✞✁✄✂ Operationally, ✂✞✁✄✂ this means that no matching is done on a ˜ ✞ pattern until one of the variables in ✞ is used. At that point the entire pattern is matched against the value, and if the match fails or diverges, so does the overall computation. 3. Matching the wildcard pattern _ against any value always succeeds, and no binding is done.

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