Lesson 1: Syllabus & Intro to Basic Math:Lesson 2: Variables, Types, and Boolean AlgebraLesson 3: Type Coercion / Conversion, Plus ComparisonsLesson 4: if, for, while, and some functionsLesson 5: Objects and More Function Basics!Lesson 6: Arrays and HTML ProjectLesson 7: Advanced Functions I: Closures, IIFEs, Factory Functions, and ModulesLesson 8: Advanced PrimitivesLesson 9: Application Programming Interfaces (APIs)Lesson 10: Advanced Functions II: Promises, Async/AwaitLesson 11: Advanced Functions III: Higher Order Functions (HOFs)Lesson 12: Advanced Objects I: PrototypesLesson 13: Advanced Functions IV: Advanced this(Bind, Call, Apply), and Function===ObjectLesson 14: Advanced Objects II: ClassesLesson 4-3 Class InheritanceLesson 16: Advanced Functions 5: Arrow Functions and Default Function Parameters, and functional ...restLesson 18: Review time!Lesson 19: Export/ImportLesson 20: Intro to React, React Native, and Expo (React Day 1)Lesson 21: React Day 2: this.props and React Event HandlingLesson 22: React Day 3: Lifting this.state upLesson 23: ScrumWorkshop #1: UX/UI Best Practices and Trends
Lesson 17: let and const
{
var something;
//I'm the global scope
if (something) {
//Im in a block scope
}
var obj = {
//I'm also in a block scope
func() {
//Any function scope is also a block scope
},
attr: {
//hey, I'm in a block scope in a block scope!
}
};
}
{
if(false) //this isn't run... or is it?
{
var bob = 'bob'
}
bob = 'joe' //this should not work because var bob should never be declared
return bob;
}
{
var insecureUserIsLoggedIn = false;
var insecureUserIsLoggedIn = true;
return insecureUserIsLoggedIn
}
{
if(false) {
let bob = 'bob'
}
bob='joe'
return bob
}
{
let bob = 'bob'
let bob = 'joe'
return bob
}
{
const str = 'constant'
str = 'bob'
return str
}
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
