playing around with https://babeljs.io/repl/

babelTests.js

let a = d => d * 4

const test13 = 'TESTING ! 2 3'

let e = [1,2,3]

let f = e.map( v => v * 2 )

let test = {
  a : 'me',
  friends: [],
  showFriends() {
    this.friends.forEach( friend => console.log( this.a + ' knows ' + f ))
  },
}

class Widget {
  constructor( a,b ) {
    console.log("WIDGET", a, b)
    this.testing = a * b
  }
  blah () { return 'blah' }
}

class Slider extends Widget {
   constructor( a,b ) {
     super( a,b )
     
     this.x = this.y = 0
   }
   
   static number = 10
   
   move( xamt, yamt ) {
     this.x += xamt
     this.y += yamt
   }
}

var z = new Slider( 2, 4 )
z.move( 10, 2 )

Slider.number = 5
console.log( Slider.number )


var q = new Slider( 5, 10 )
Slider.number = 20

console.log( Slider.number )
console.log( q.blah(), q.testing )

let urk = { a: 1 }
let hmm = 'hmmm'
let urk2 = {
  __proto__: urk,
  hmm,
  [ hmm + '33' ] : 42
}

console.log( urk2.a, urk2.hmm, urk2.hmmm33 )

let stringTest = `this is a 
test.`

let nice = `${stringTest} is great ${ 5 + 10 * 20 }!`
console.log( nice )

var {test1:x,test2:y,test3:z} = { test1:1, test2:2, test3:3 }

var [q, , w] = [1,2,3]

var {test1, test2, test3 } = { test1:1, test2:2, test3:3 }

console.log( x,y,z )
console.log( test1, test3 );

var tt = [0,0,0].fill('hi',2)
console.log( tt.indexOf('hi') )
console.log( tt )

let aa = function(duration = 0, r ) {
  return new Promise( (res, rej) => {
    setTimeout( res, duration )
  })
}

let p = aa( 1000 )
p.then(() => { console.log("EHROEH") })