Go! (programming language): Difference between revisions

Revision as of 12:46, 13 January 2017

Revision as of 17:58, 10 March 2017

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Gender [[#algebraic|'''::=''']] male | female.

person [[#interface|'''<˜~''']] {dayOfBirth:[] '''=>''' ''day''.

age:[] '''=>''' ''integer''.

gender:[] '''=>''' Gender.

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{{anchor|algebraic}}The <code>::=</code> rule defines a new [[algebraic data type]], a [[data type]] with only data constructors.

{{anchor|interface}}The <code><˜~</code> rule defines an interface type - it indicates what properties are characteristic of a <code>person</code> and also gives type constraints on these properties. It documents that <code>age</code> is a functional property with an integer value, that <code>lives</code> is a unary relation over strings, and that <code>dayOfBirth</code> is a functional property with a value that is an object of type <code>day</code>.

{{anchor|theory}}The <code>$=</code> type rule indicates that there is also a theory label, with the functor <code>person</code>, for a theory that defines the characteristic properties of the <code>person</code> type - implements the <code>person</code> interface - in terms of four given parameters of types string, <code>day</code>, <code>Gender</code>, and <code>string</code>.