TypeScript has ‘interface‘ and ‘type‘, so when to use which?
interface hasName { firstName: string; lastName: string; } interface hasAddress { address: string } type Player = (hasName & hasAddress) | null; let player: Player = {firstName: ‘Joe‘, lastName: ‘Jonse‘, address: ‘USA‘};
It is recommended that to use ‘interface‘ to define the props that obj should have.
‘type‘ is recommended to use when combine multi interfaces to descide a single object like what we show in example.
[TypeScript] Typescript Interfaces vs Aliases Union & Intersection Types
原文：http://www.cnblogs.com/Answer1215/p/6511592.html