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2.4 Abstract Members

'abstract [keywords] name': params

Declare an abstract method name as having params parameters, having optional additional keywords keywords.

Abstract members permit declaring an API, deferring the implementation to a subtype. Abstract methods are declared as an array of string parameter names params.

    // declares abstract method 'connect' expecting the two parameters, 'host'
    // and 'path'
    { 'abstract connect': [ 'host', 'path' ] }

• Abstract members are defined using the abstract keyword.
  • Except in interfaces (see Interfaces), where the abstract keyword is implicit.
• Currently, only methods may be declared abstract.
• The subtype must implement at least the number of parameters declared in params, but the names needn't match.
  • Each name in params must be a valid variable name, as satisfied by the regular expression /^[a-z_][a-z0-9_]*$/i.
  • The names are use purely for documentation and are not semantic.

Abstract members may only be a part of one of the following:

• Interfaces
• Abstract Classes