enum-fp
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Functional enum type for javascript with simple pattern matching
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<a href="index.html">All files</a> EnumTag.js
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// type TypeConstructor = ...a -> EnumTagType
// validateArguments :: (?Array String, [a]) -> Boolean
const validateArguments = (props, args) =>
!props? true : props.length === args.length;
// (constructor)
// EnumTag :: (String, EnumType, ?Array String) -> TypeConstructor
export const EnumTag = (name, Type, props) => (...args) => {
if(!validateArguments(props, args))
throw new TypeError(`Invalid number of arguments passed to constructor ${name}`);
const self = {
// args :: Array *
args,
// name :: String
name,
// props :: ?Array String
props,
// is :: String | EnumTagType | ConstructorDescription ~> Boolean
is: otherType => [otherType, otherType.name].indexOf(name) !== -1,
};
// match :: Object (* -> b) ~> b
self.match = pattern => Type.match(self, pattern);
return self;
};
export default EnumTag;
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