feat: add .toResult<E>(error: E) to Maybe class (#177)

src/maybe/maybe.spec.ts

@@ -547,4 +547,20 @@ describe('Maybe', () => {
       expect(Maybe.some(1).valueOrThrowErr()).toEqual(1)
     })
   })
+
+  describe('toResult', () => {
+    it('should return result object with success', () => {
+      const hasSome = maybe('hi')
+      const sut = hasSome.toResult(new Error('oops'))
+
+      expect(sut.unwrap()).toEqual('hi')
+    })
+
+    it('should return result object with fail', () => {
+      const hasSome = maybe()
+      const sut = hasSome.toResult(new Error('oops'))
+
+      expect(sut.unwrapFail()).toEqual(new Error('oops'))
+    })
+  })
 })

src/maybe/maybe.ts

@@ -1,3 +1,5 @@
+import { IResult } from '../result/result.interface'
+import { FailResult, OkResult } from '../result/result'
 import { IMaybePattern, IMaybe } from './maybe.interface'
 
 export class Maybe<T> implements IMaybe<T>  {
@@ -107,4 +109,10 @@ export class Maybe<T> implements IMaybe<T>  {
     return maybe.flatMap(a => this.map(b => typeof b === 'function' ? b(a) : a))
   }
 
+  public toResult<E>(error: E): IResult<T, E> {
+    return this
+      .map<IResult<T, E>>(b => new OkResult<T, E>(b))
+      .valueOr(new FailResult<T, E>(error))
+  }
+
 }