Or with an algebraic Maybe data type {this.state.user.case({ some: user => `Hello ${ user.name }` none: () => `Please log in` })} Or for async req

Or with an algebraic Maybe data type {this.state.user.case({ some: user => `Hello ${ user.name }` none: () => `Please log in` })} Or for async requests that are in progress, an algebraic 3-state type: https://twitter.com/Tholle1234/status/804796967222202372 https://twitter.com/Tholle1234/status/804796967222202372