21 lines
448 B
TypeScript
21 lines
448 B
TypeScript
interface IList<A> {
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map<B>(f: (t: A) => B): IList<B>;
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}
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class Nil<C> implements IList<C>{
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map<D>(f: (t: C) => D): IList<D> {
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return null;
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}
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}
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class Cons<T> implements IList<T>{
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map<U>(f: (t: T) => U): IList<U> {
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return this.foldRight(new Nil<U>(), (t, acc) => {
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return new Cons<U>();
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});
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}
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foldRight<E>(z: E, f: (t: T, acc: E) => E): E {
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return null;
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}
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} |