Technology
In this Hasty Treat, Scott and Wes talk about enums in JS — what they are, what they do, and how they work in JavaScript. LogRocket - Sponsor LogRocket lets you replay what users do on your site, helping you reproduce bugs and fix issues faster. It’s an exception tracker, a session re-player and a performance monitor. Get 14 days free at logrocket.com/syntax. Show Notes 03:11 - What are enums? A type restricting variables to one value from a predefined set of constants Direction = UP / DOWN / LEFT / RIGHT Role = ADMIN EDITOR AUTHOR VIEWER Day of the Week 05:12 - In GraphQL enum Role { ADMIN EDITOR AUTHOR VIEWER} Then 07:05 - In TypeScript First, declare the type: enum direction = { UP, DOWN, LEFT, RIGHT } Then when you defined your function, use that type type User { role: Role } or type User { role: [Role] } 08:49 - In JavaScript Not in JS yet There is a proposal in stage 1 https://github.com/rbuckton/proposal-enum And a babel plugin: https://www.npmjs.com/package/babel-plugin-const-enum Can use case/switch Can use Object or Map keys Links Syntax 287: Hasty Treat - Records and Tuples in JavaScript Tweet us your tasty treats! Scott’s Instagram LevelUpTutorials Instagram Wes’ Instagram Wes’ Twitter Wes’ Facebook Scott’s Twitter Make sure to include @SyntaxFM in your tweets