exposing either functionality

dist/cjs/subterfuge.js

@@ -60,9 +60,26 @@ const composeRight = (func1, func2) => (...args) => func1(func2(...args));
 const pipeLeft = (...funcs) => funcs.reduce(composeLeft);
 const pipeRight = (...funcs) => funcs.reduce(composeRight);
 
+const Left = value => ({
+  map: func => Left(value),
+  fold: (errorhandler, successhandler) => errorhandler(value),
+  inspect: () => `Left(${value})`
+});
+
+const Right = value => ({
+  map: func => Right(func(value)),
+  fold: (errorhandler, successhandler) => successhandler(value),
+  inspect: () => `Right(${value})`
+});
+
+const Either = value => (value == null ? Left(value) : Right(value));
+
 exports.Box = Box;
 exports.LazyBox = LazyBox;
 exports.composeLeft = composeLeft;
 exports.composeRight = composeRight;
 exports.pipeLeft = pipeLeft;
 exports.pipeRight = pipeRight;
+exports.Either = Either;
+exports.Left = Left;
+exports.Right = Right;

dist/es/subterfuge.js

@@ -56,4 +56,18 @@ const composeRight = (func1, func2) => (...args) => func1(func2(...args));
 const pipeLeft = (...funcs) => funcs.reduce(composeLeft);
 const pipeRight = (...funcs) => funcs.reduce(composeRight);
 
-export { Box, LazyBox, composeLeft, composeRight, pipeLeft, pipeRight };
+const Left = value => ({
+  map: func => Left(value),
+  fold: (errorhandler, successhandler) => errorhandler(value),
+  inspect: () => `Left(${value})`
+});
+
+const Right = value => ({
+  map: func => Right(func(value)),
+  fold: (errorhandler, successhandler) => successhandler(value),
+  inspect: () => `Right(${value})`
+});
+
+const Either = value => (value == null ? Left(value) : Right(value));
+
+export { Box, LazyBox, composeLeft, composeRight, pipeLeft, pipeRight, Either, Left, Right };

src/index.js

@@ -2,3 +2,4 @@ export { Box } from './containers/box';
 export { LazyBox } from './containers/lazybox';
 export { composeLeft, composeRight } from './composition/compose';
 export { pipeLeft, pipeRight } from './composition/pipe';
+export { Either, Left, Right } from './containers/either';