diff --git a/README.md b/README.md
index 9fed340..adf4a69 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# MojiScript ![project:experimental](https://img.shields.io/badge/project-experimental-orange.svg) [![build status](https://travis-ci.org/joelnet/MojiScript.svg?branch=master)](https://travis-ci.org/joelnet/MojiScript) [![Coverage Status](https://coveralls.io/repos/github/joelnet/MojiScript/badge.svg?branch=master&v=1)](https://coveralls.io/github/joelnet/MojiScript?branch=master) ![project:experimental](https://img.shields.io/badge/tests-374-green.svg) [![All Contributors](https://img.shields.io/badge/all_contributors-19-orange.svg?style=flat-square)](#contributors)
+# MojiScript ![project:experimental](https://img.shields.io/badge/project-experimental-orange.svg) [![build status](https://travis-ci.org/joelnet/MojiScript.svg?branch=master)](https://travis-ci.org/joelnet/MojiScript) [![Coverage Status](https://coveralls.io/repos/github/joelnet/MojiScript/badge.svg?branch=master&v=1)](https://coveralls.io/github/joelnet/MojiScript?branch=master) ![project:experimental](https://img.shields.io/badge/tests-380-green.svg) [![All Contributors](https://img.shields.io/badge/all_contributors-19-orange.svg?style=flat-square)](#contributors)
 
 ![MojiScript logo](https://raw.githubusercontent.com/joelnet/MojiScript/master/media/MS_logo_64.png)
 
diff --git a/type/Just.js b/type/Just.js
index 544601f..b6cd272 100644
--- a/type/Just.js
+++ b/type/Just.js
@@ -41,6 +41,10 @@ function getOrElse() {
   return this.value
 }
 
+function getValue(errCallback, dataCallback) {
+  return dataCallback(this.value)
+}
+
 const prototype = {
   '@@type': typeJust,
   ap,
@@ -49,6 +53,7 @@ const prototype = {
   flatMap,
   leftMap,
   getOrElse,
+  getValue,
   'fantasy-land/ap': ap,
   'fantasy-land/map': map,
   toString() { return this.value.toString() },
diff --git a/type/Left.js b/type/Left.js
index 819e978..27c504d 100644
--- a/type/Left.js
+++ b/type/Left.js
@@ -47,6 +47,10 @@ function getOrElse(defaultValue) {
   return defaultValue
 }
 
+function getValue(errCallback) {
+  return errCallback(this.value)
+}
+
 const prototype = {
   '@@type': typeLeft,
   ap,
@@ -56,6 +60,7 @@ const prototype = {
   leftMap,
   leftFlatMap,
   getOrElse,
+  getValue,
   'fantasy-land/ap': ap,
   'fantasy-land/map': map,
   inspect() {
diff --git a/type/Nothing.js b/type/Nothing.js
index b65b38d..0413c76 100644
--- a/type/Nothing.js
+++ b/type/Nothing.js
@@ -5,6 +5,10 @@ function getOrElse(defaultValue) {
   return defaultValue
 }
 
+function getValue(errCallback) {
+  return errCallback()
+}
+
 const Nothing = Object.freeze(Object.create(
   {
     '@@type': typeNothing,
@@ -16,6 +20,7 @@ const Nothing = Object.freeze(Object.create(
     leftMap: func => Just(func()),
     flatMap: () => Nothing,
     getOrElse,
+    getValue,
     'fantasy-land/map': () => Nothing,
     toJSON: () => null
   },
diff --git a/type/Right.js b/type/Right.js
index 5d216c6..5f45ffa 100644
--- a/type/Right.js
+++ b/type/Right.js
@@ -49,6 +49,10 @@ function getOrElse() {
   return this.value
 }
 
+function getValue(errCallback, dataCallback) {
+  return dataCallback(this.value)
+}
+
 const prototype = {
   '@@type': typeRight,
   ap,
@@ -58,6 +62,7 @@ const prototype = {
   leftMap,
   leftFlatMap,
   getOrElse,
+  getValue,
   'fantasy-land/ap': ap,
   'fantasy-land/map': map,
   inspect() {
diff --git a/type/__tests__/Just.test.js b/type/__tests__/Just.test.js
index e2b2cbb..93af7ff 100644
--- a/type/__tests__/Just.test.js
+++ b/type/__tests__/Just.test.js
@@ -74,6 +74,13 @@ describe('type/Just', () => {
     expect(actual).toBe(expected)
   })
 
+  test('getValue', () => {
+    expect.assertions(1)
+    const expected = 'abc'
+    const actual = Just('abc').getValue(() => 123, x => x)
+    expect(actual).toBe(expected)
+  })
+
   test('fantasy-land/map', () => {
     expect.assertions(1)
     const expected = 888
diff --git a/type/__tests__/Left.test.js b/type/__tests__/Left.test.js
index 645ea0b..78408fe 100644
--- a/type/__tests__/Left.test.js
+++ b/type/__tests__/Left.test.js
@@ -105,6 +105,13 @@ describe('type/Left', () => {
     expect(actual).toBe(expected)
   })
 
+  test('getValue', () => {
+    expect.assertions(1)
+    const expected = 888
+    const actual = Left(expected).getValue(err => err, () => 123)
+    expect(actual).toBe(expected)
+  })
+
   test('Left(abc).inspect', () => {
     expect.assertions(1)
     const expected = 'Left ("abc")'
diff --git a/type/__tests__/Nothing.test.js b/type/__tests__/Nothing.test.js
index 0f0af50..6b08c83 100644
--- a/type/__tests__/Nothing.test.js
+++ b/type/__tests__/Nothing.test.js
@@ -58,6 +58,12 @@ describe('type/Nothing', () => {
     expect(actual).toBe(expected)
   })
 
+  test('getValue', () => {
+    expect.assertions(1)
+    const expected = 'abc'
+    const actual = Nothing.getValue(() => expected, () => 123)
+    expect(actual).toBe(expected)
+  })
 
   test('fantasy-land/map', () => {
     expect.assertions(1)
diff --git a/type/__tests__/Right.test.js b/type/__tests__/Right.test.js
index 4812602..ef1ce2d 100644
--- a/type/__tests__/Right.test.js
+++ b/type/__tests__/Right.test.js
@@ -84,6 +84,13 @@ describe('type/Right', () => {
     expect(actual).toBe(expected)
   })
 
+  test('getValue', () => {
+    expect.assertions(1)
+    const expected = 888
+    const actual = Right(expected).getValue(() => 123, data => data)
+    expect(actual).toBe(expected)
+  })
+
   test('Right(abc).inspect', () => {
     expect.assertions(1)
     const expected = 'Right ("abc")'