KKrisu

// Place your key bindings in this file to overwrite the defaults
[
    { "key": "ctrl+e", "command": "editor.action.deleteLines",
                                     "when": "editorTextFocus && !editorReadonly" },
    { "key": "alt+up", "command": "editor.action.insertCursorAbove",
                                     "when": "editorTextFocus" },
    { "key": "alt+down", "command": "editor.action.insertCursorBelow",
                                     "when": "editorTextFocus" },
    { "key": "alt+shift+up", "command": "editor.action.moveLinesUpAction",
                                     "when": "editorTextFocus && !editorReadonly" },

KKrisu

parent.console.clear();

let o1 = {a: 1};
let o2 = {a: 1};

let o = {};
o[34] = 'a';
o['34'] = 'a';
o[o1] = 'b';
o[o2] = 'c';

KKrisu

parent.console.clear();

function asyncFunction(id = '', delay = 1000) {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      // resolve('yeah ' + id);
      reject('nooo ' + id);
    }, delay);
  });
}

KKrisu

parent.console.clear();

// var {a, b} = {a: 1, b: 2};
var a = 1;
var b = 2;

// console.log(a, b);

var bar = 'test';

KKrisu

// var text = `something`;

// var template = '' +
//   '<div>' +
//     '<input>' +
//   '</div>';
  
// console.log(template);

// var template2 = `

KKrisu

// # Arrays

// var a = ['a', 'b', 'c'];

// var i = a[0];
// var j = a[1];
// var k = a[2];

// var [i, j, k] = a;
// var [i, j, k] = ['a', 'b', 'c'];

KKrisu

// FUNCTIONS

// use on babeljs.io/repl


function declaration() {
  console.log('declaration');
}

var expression = function() {

KKrisu

let / const declarations do hoist, but they throw errors when accessed before being initialized (instead of returning undefined as var would)

let x = 'outer scope';
console.log(x); // => outer scope

(function() {

  console.log(x); // => ReferenceError (let is hoisted, but doesn't allow accessing)
  
  console.log(y); // => undefined (var is hoisted and allows accessing)

KKrisu

input: var a = [2, 3, 5]
Task: we want to fill array with undefineds to 6th element.
output: [2, 3, 5, undefined, undefined, undefined]

ES5 solutions:

1. a.length = 6 result: [2, 3, 5, undefined x 3]
   Problem: this array has sparse elements (holes) on elements 3-5. We can iterate through it like: for (i = a.length ; i-- ;) {}, but when we iterate like: a.forEach(callback) it only goes through iterable values.

KKrisu

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