Dependency Injection basics- Fun Fun Function

💖 Support the show by becoming a Patreon https://www.patreon.com/funfunfunction Dependency injection (here shown using JavaScript) is a software design pattern that is primarily to make code unit testable, by moving the responsibility for getting dependencies outside the code that depends on it. It does require some restructuring of your application, which feels a bit wrong to do just to get testability, but it’s an otherwise remarkably simple pattern that gets the job done. 🔗 Code from the episode https://gist.github.com/mpj/c55dc66bc2cfd389dbbd25ab5092d4f3 🔗 Promises in JavaScript video https://www.youtube.com/watch?v=2d7s3spWAzo 🔗 Fetch API video https://www.youtube.com/watch?v=g6-ZwZmRncs 🔗 Composition over inheritance (Other video referenced at the end) https://www.youtube.com/watch?v=GhbhD1HR5vk&index=1&list=PL0zVEGEvSaeHBZFy6Q8731rcwk0Gtuxub 🔗 Mocha (test runner for JavaScript) https://mochajs.org/ 🔗 node.js (run JavaScript in the command line) https://nodejs.org/en/ 🔗 npm (package manager for JavaScript) https://www.npmjs.com/ 🔗 Music: Peacock by 7 minutes dead https://www.youtube.com/watch?v=Mi-xOhMqrkg 🔗 Music: Funky One by Incompetech http://incompetech.com/music/royalty-free/index.html?keywords=Funky+One 🔗 FIGHT by Tokyo Machine https://www.youtube.com/watch?v=qvBlHBHUTMs 💛 Follow on Twitch We record the show live Mondays 7 AM PT https://twitch.tv/funfunfunction 💛 Fun Fun Forum Private discussion forum with other viewers in between shows. https://www.funfunforum.com. Available to patron members, become one at https://www.patreon.com/funfunfunction 💛 mpj on Twitter https://twitter.com/mpjme 💛 CircleCI (Show sponsor) Robust and sleek Docker-based Continuous Integration as a service. I used CircleCI prior to them becoming a sponsor and I love that their free tier is powerful enough for small personal projects, even if they are private. Use this link when you sign up to let them know you came from here: https://cir