1. Number 
2. String
3. Boolean
4. Undefined
5. Null
6. Symbol (new in ECMAScript 6)
7. Object


!==
===
>=
<=
>
<


var
let (new in ECMAScript 6)
const (new in ECMAScript 6)


if
else
else if
ternary operator
switch


&&
||
!


var a = function name() {}
function name() {}
return
() => (fat arrow function — new in ECMAScript 6)


Array
Object


or
while
do 
forEach (new in ECMAScript 5) 
forin (new in ECMAScript 5) 
forof (new in ECMAScript 5)


LET and CONST variables 
Hoisting variables (LET and CONST) 
Arrow => function short hand 
Arrow functions and THIS
Function default parameter values
Object literals short hand
Rest … operator 
Spread … operator 
For Of Loop
Template literals
Destructing arrays[ ] with default parameters
Destructing {Objects} with alias