Add classes used for better management of errors

src/scripts/classes/result.ts

@@ -0,0 +1,49 @@
+export type Result<L, A> = Failure<L, A> | Success<L, A>;
+
+export class Failure<L, A> {
+    readonly value: L;
+
+    constructor(value: L) {
+        this.value = value;
+    }
+
+    isFailure(): this is Failure<L, A> {
+        return true;
+    }
+
+    isSuccess(): this is Success<L, A> {
+        return false;
+    }
+
+    applyOnSuccess<B>(_: (a: A) => B): Result<L, B> {
+        return this as any;
+    }
+}
+
+export class Success<L, A> {
+    readonly value: A;
+
+    constructor(value: A) {
+        this.value = value;
+    }
+
+    isFailure(): this is Failure<L, A> {
+        return false;
+    }
+
+    isSuccess(): this is Success<L, A> {
+        return true;
+    }
+
+    applyOnSuccess<B>(func: (a: A) => B): Result<L, B> {
+        return new Success(func(this.value));
+    }
+}
+
+export const failure = <L, A>(l: L): Result<L, A> => {
+    return new Failure(l);
+};
+
+export const success = <L, A>(a: A): Result<L, A> => {
+    return new Success<L, A>(a);
+};