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20 lines
291 B
TypeScript
20 lines
291 B
TypeScript
export interface Maybe<T> {
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isJust(): this is Just<T>;
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}
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export type Just<T> = Maybe<T> & {
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get(): T
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};
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export function just<T>(value: T): Just<T> {
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return {
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isJust: () => true,
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get: () => value
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};
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}
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export function nothing<T>(): Maybe<T> {
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return {
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isJust: () => false,
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};
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}
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