mariyadiminsky

// #1 ES6: if passing one argument you don't need to include parenthesis around parameter.
var kitty = name => name;

// same as ES5:
var kitty = function(name) {
  return name;
};

// #2 ES6: no parameters example.
var add = () => 3 + 2;

mariyadiminsky

// Line breaks are not allowed and will throw a syntax error
let func1 = (x, y)
=> {
  return x + y;
}; // SyntaxError

// But line breaks inside of a parameter definition is ok
let func6 = (
  x,
  y

mariyadiminsky

// #1
// Before:
function sayHi(petSquirrelName) { console.log('Greetings ' + petSquirrelName + '!'); }
sayHi('Brigadier Sir Nutkins II'); // => Greetings Brigadier Sir Nutkins II!

// After:
function sayHi(petSquirrelName) { console.log(`Greetings ${petSquirrelName}!`); }
sayHi('Brigadier Sir Nutkins II'); // => Greetings Brigadier Sir Nutkins II!

// #2

mariyadiminsky

function bunnyBailMoneyReceipt(bunnyName, bailoutCash) {
  var bunnyTip = 100;
  
  console.log(
    `
    Greetings ${bunnyName.toUpperCase()}, you have been bailed out!
    
      Total: $${bailoutCash}
      Tip: $${bunnyTip}
      ------------

mariyadiminsky

var squirrelNames = ['Lady Nutkins', 'Squirrely McSquirrel', 'Sergeant Squirrelbottom'];
var bunnyNames = ['Lady FluffButt', 'Brigadier Giant'];
var animalNames = ['Lady Butt', squirrelNames, 'Juicy Biscuiteer', bunnyNames];

animalNames;
// => ['Lady Butt', ['Lady Nutkins', 'Squirrely McSquirrel', 'Sergeant Squirrelbottom'], 'Juicy Biscuiteer', ['Lady FluffButt', 'Brigadier Giant']]

// To flatten this array we need another step:
var flattened = [].concat.apply([], animalNames);
flattened;

mariyadiminsky

var squirrelNames = ['Lady Nutkins', 'Squirrely McSquirrel', 'Sergeant Squirrelbottom'];
var bunnyNames = ['Lady FluffButt', 'Brigadier Giant'];
var animalNames = ['Lady Butt', ...squirrelNames, 'Juicy Biscuiteer', ...bunnyNames];

animalNames;
// => ['Lady Butt', 'Lady Nutkins', 'Squirrely McSquirrel', 'Sergeant Squirrelbottom', 'Juicy Biscuiteer', 'Lady FluffButt', 'Brigadier Giant']

mariyadiminsky

var values = [25, 50, 75, 100]

// This:
console.log(Math.max(25, 50, 75, 100)); // => 100

// Is the same as this:
console.log(Math.max(...values)); // => 100

/* 
  NOTE: Math.max() typically does not work for arrays unless you write it like:

mariyadiminsky

function myFunction(x, y, z) {
  console.log(x + y + z)
};
var args = [0, 1, 2];
myFunction.apply(null, args);
// => 3

mariyadiminsky

function myFunction(x, y, z) {
  console.log(x + y + z);
}
var args = [0, 1, 2];
myFunction(...args);
// => 3

mariyadiminsky

var dateFields = readDateFields(database);
var d = new Date(…dateFields);