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interface Functor {
fmap: (any) => any;
}
interface Monad extends Functor {
bind: (any) => Monad;
}
interface Maybe extends Monad {
}
class Just implements Maybe {
private value: any;
constructor(a: any) {
this.value = a
}
fmap (f: (any) => any): Just {
return new Just(f(this.value))
}
bind (f: (any) => Maybe): Maybe {
return f(this.value)
}
}
class Nothing implements Maybe {
fmap (f: (any) => any): Nothing {
return this
}
bind (f: (any) => Maybe): Maybe {
return this
}
}
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