ES Update
A Wee Catch Up On the Language
you Thought you Knew
Let's Begin! (Space or Arrow Keys to Navigate)
Block Scoped Variables
JavaScript Joins the ranks of other languages with block scoping
let and const
New keywords for declaring block-scoped mutable and immutable variables
Arrow Functions
A concise way to define function expressions
Arrow Functions - this Binding
this is a notoriously cryptic keyword in JavaScript
Arrow functions provide a more predictable behaviour for this
Destructuring Assignment
Destructuring lets us describe the structure of data while simultaneously assigning names to its members
It reduces the surface area for bugs, encourages immutable flows, and reduces boilerplate when defining functions
Destructuring Assignment - Arrays
Destructuring Assignment - Objects
Destructuring Assignment - Aliasing
Destructuring Assignment - Function Params
Rest and Spread
Rest and Spread - Tricks
Default Parameters
Concise Object Syntax
When initializing objects, if you have a variable with the same name as one of your keys, you can skip the assignment
Computed Object Keys
Prior to ES2015, we couldn't initialize a new object with dynamic keys
Template Literals
class Keyword
Let's get one thing very clear: JavaScript does not have classes - Not then, and not now. The class keyword simply helps us write object constructors with their prototype methods more concisely
Promises
A promise is a container (monad) for a future value. You can unwrap the value with the then method, or the error state with the catch method
async Functions
Syntactic sugar for promise flows that makes async code look sync
Async functions always return promises, and any errors thrown will reject the promise
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