//function

function myFunc0(x){

if (typeof x !== 'number') {

throw 'Not a number';

}

return 2*x;

}

myFunc0(-3);

var myFunc1 = function(x){

return 2*x;

};

myFunc1(3);

function myFunc2(){

for (var i=0; i<arguments.length; i++){

console.log(String(i) + ': '+ arguments[i]);

}

}

myFunc2(2,3,3,4);

function myFunc3(x, ...rest){

console.log('0: '+x);

for (var i=0; i<rest.length; i++){

console.log(String(i) + ': '+ rest[i]);

}

}

myFunc3(2,3,3,4);

//scope

var z1 = 233;

window.z1 = 234;

var MYSCOPE = {};

MYSCOPE.x1 = 233;

function myFunc4(){

for (var tmp1=0; tmp1<100; tmp1++){}

console.log(tmp1);

}

function myFunc5(){

for (let tmp1=0; tmp1<100; tmp1++){}

// console.log(tmp1); //error

}

//const

const PI = 3.14;

//Destructuring

var [x1,x2,x3] = [2,3,3]; //x1=2; x2=3; x3=3;

// var x1,x2,x3=[2,3,3]; //x1=undefined; x2=undefined; x3=[2,3,3];

var [[x1]] = [[233]];

var [,,x1] = [2,3,3];

var {x1,x2} = {

x1:233,

x2:'233'

};

var {x1:{x2}} = {x1: {x2:233}}; //x1(not defined); x2=233;

//generator

function* myFunc6(num1) {

var x1=0,x2=1,ind1=0;

while (ind1<num1){

yield x1;

[x1,x2] = [x2,x1+x2];

ind1 ++;

}

return;

}

myFunc6(5).next();

for (var x of myFunc6(5)){ console.log(x); }

//class + object

var Student = {

name:'Robot',

height:1.2,

run: function() { console.log(this.name+' is running...'); }

};

function createStudent(name){

var s = Object.create(Student);

s.name = name;

return s;

}

var x1 = createStudent('x1');

x1.run();