55 lines
1009 B
TypeScript
55 lines
1009 B
TypeScript
// Copyright (c) 2021 MillenniumEarl
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//
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// This software is released under the MIT License.
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// https://opensource.org/licenses/MIT
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export type Result<L, A> = Failure<L, A> | Success<L, A>;
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export class Failure<L, A> {
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readonly value: L;
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constructor(value: L) {
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this.value = value;
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}
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isFailure(): this is Failure<L, A> {
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return true;
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}
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isSuccess(): this is Success<L, A> {
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return false;
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}
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applyOnSuccess<B>(_: (a: A) => B): Result<L, B> {
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return this as any;
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}
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}
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export class Success<L, A> {
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readonly value: A;
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constructor(value: A) {
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this.value = value;
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}
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isFailure(): this is Failure<L, A> {
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return false;
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}
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isSuccess(): this is Success<L, A> {
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return true;
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}
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applyOnSuccess<B>(func: (a: A) => B): Result<L, B> {
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return new Success(func(this.value));
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}
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}
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export const failure = <L, A>(l: L): Result<L, A> => {
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return new Failure(l);
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};
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export const success = <L, A>(a: A): Result<L, A> => {
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return new Success<L, A>(a);
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};
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