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Saved by 1 people (0 private), first by anonymouse user on 2007-10-10
- Ratbeard on 2007-10-10 - Tags checkout , functional , programming
Public Sticky notes
Each program in Clean
computes the value of the expression Start.
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An infix operator is in fact just an ordinary function of two arguments that is written between its arguments:
x^n.
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A guard is a boolean expression that can be inserted between the patterns of a function alternative and the symbol =. The symbol |
separates the patterns and the guard. The alternative is only applied when the guards yields True.
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In general a list
comprehension yields the list of values indicated between [ and \\. These values are computed for each element of the generators (between // and |), that obeys the condition between | and ]
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The scope of local definitions is the function alternative where they are
defined. Local definitions are used to limit the scope of definitions, to share a value or to name an expression.
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In this example the generators are separated by a semicolon, this implies that all possible combinations of elements from the generators are considered.
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In Clean
a class is a family of functions with the same name. The difference between these family members is the type processed.
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This reads the
increment of item i, is that item with the field quantity set to the increment of that field from the argument record.
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To be member of the same class, datatypes need not have any relation. It is sufficient that the appropriate functions are defined for that datatype.
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the classes in Clean
are more general than the notion of classes in most object oriented languages.
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The terse syntax makes that you have a clear view over
what is actually happening in this function.
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The static type system of Clean
guarantees that runtime type errors cannot occur.
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