36 lines
744 B
TypeScript
36 lines
744 B
TypeScript
export class Fallible<R, E> {
|
|
private value?: R;
|
|
private error?: E;
|
|
|
|
constructor(value?: R, error?: E) {
|
|
this.value = value;
|
|
this.error = error;
|
|
}
|
|
|
|
public getValue(): R {
|
|
if (!this.value) {
|
|
throw this.error ? this.error : new Error("No value and no error present");
|
|
}
|
|
return this.value;
|
|
}
|
|
|
|
public getError(): E {
|
|
if (!this.error) {
|
|
throw new Error("No error present");
|
|
}
|
|
return this.error;
|
|
}
|
|
|
|
public isOk(): boolean {
|
|
return !this.error && this.value !== undefined;
|
|
}
|
|
|
|
public static ok<R, E>(value: R): Fallible<R, E> {
|
|
return new Fallible<R, E>(value);
|
|
}
|
|
|
|
public static error<R, E>(error: E): Fallible<R, E> {
|
|
return new Fallible<R, E>(undefined, error);
|
|
}
|
|
}
|