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TypeScript Maybe
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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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