Monad funtional programming pattern

Content

- Result
- Either
- Option
- Guards

options => 'lodash' : lodash is inside node_modules, after running `nest new`. If it isn't, have a look at https://www.npmjs.com/package/lodash.isnil

Name		Name	Last commit message	Last commit date
Latest commit History 13 Commits
error		error
interfaces		interfaces
either.ts		either.ts
guards.ts		guards.ts
index.ts		index.ts
last-guards.ts		last-guards.ts
option.ts		option.ts
readme.md		readme.md
result.ts		result.ts