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8 Cards in this Set
- Front
- Back
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Scope of a binding |
where one variable can be called. In ML, the let expression/called variables can only be called following the operation to set the value. |
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ML Let Expression |
Syntax: let b1 b2 ... bn in e end Each b1 is a binding, and e is an expression
Type-checking: Whole expression is type e, and b1 and e are type checked in the static environment that has all previous bindings.
Evaluation: Evaluate b1 and e in dynamic environment with all previous bindings. Result of whole expression is result of evaluating e. |
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ML Options |
Synonymous with list constructs without fundamental errors of using 1 or 0 as return base for empty lists. A different construct from list though.
Holds type t; NONE for empty build that holds 0 items, SOME e for partial builds with expression.
isSome checks for NONE or SOME option valOf pulls from SOME build, exception if NONE
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Andalso |
e1 andalso e2 Evaluates e2 only if e1 evaluates to true. The result is true if e1 and e2 evaluate to true. |
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Orelse |
e1 orelse e2 Evaluates e2 only if e1 evaluates to false. The result is true if e1 or e2 evaluates to true |
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Immutable Data |
data that cannot have its value changed permanently, standard in ML where data is only changed in the environment |
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Aliasing |
creates a copy of a certain value |
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Idioms |
recognizing certain patterns required, and knowing when to use certain expressions |
