let referencetypeof operator referenceMath object referencefor loopsnew keywordfor loop (MDN)this, and return (video)if/else statementsif/else referencelet, var, and constlet (MDN)const (MDN)var (MDN)let vs var (StackOverflow)Using Simple CSS Selectors quiz (Khan Academy) -- use hint/explanation links if you're not sure
on() methodthisthisthis (MDN)starter-code > optional > person-module
Build a module that creates a person by following the steps in the app.js file.
starter-code > optional > iife-exercise
Build a function that logs the value of a counter variable, using both the let and var keywords. A classic JavaScript brain teaser.
firebase.database.Reference API documentation