Learn JS

//print 
console.log("ok google");

//variable type
var yourname = 'yukihana';
var number = 12345;
var bollean1 = true;
var bollean2 = false;
var array1 = ['yuki','hana'];
var array2 = {'hana':'1','yuki':'2'};
var null_test = null;
var nothing;

//print variable type
console.log(typeof yourname);
console.log(typeof number);
console.log(typeof bollean1);
console.log(typeof bollean2);
console.log(typeof array1);
console.log(typeof array2);
console.log(typeof null_test);
console.log(typeof nothing);

//constant
const PI = 3.14;
console.log(PI);

//test change value
// PI = 1;
// console.log(PI);

//opperation
var day = 31;
var month = 8;
var year = 7;

var total = day + month + year;

console.log(day+"-"+month+"-"+year);
console.log(total);

//assignment opperation
var x = 5;
var y = 6;

console.log("Value : " + x);
x += y; 
// x -= y;
// x /= y;
// x *= y;
// x %= y;
console.log("Value after assignment: " + x);

var q = 29;
var w = 19;

console.log( typeof q == w );
console.log( typeof q === w );
console.log( typeof q != w );
console.log( typeof q !== w );
console.log( typeof q > w );
console.log( typeof q < w );
console.log( typeof q >= w );
console.log( typeof q <= w );

var e = 13;
var f = 13;
var g = 13;
var h = 13;

++e;
f++;
--g;
h--;
console.log(e);
console.log(f);
console.log(g);
console.log(h);

var i = true;
var j = true;
 
console.log('x        : ' + i + '<br/>');
console.log('y        : ' + j + '<br/>');
console.log('!x       : ' + !i + '<br/>');
console.log('!y       : ' + !j + '<br/>');
console.log('x and y  : ' + (i && j) + '<br/>');
console.log('x or y   : ' + (i || j) + '<br/>');
console.log('x xor y  : ' + Boolean(i ^ j) + '<br/>');

var k = 'yuki';
var l = 'hana';
var m = k + ' ' + l;

console.log('k is ' + k);
console.log('l is ' + l);
console.log('m is ' + m);

var master = 'dragneel';

 if (master == 're') {
     message = 'welcome back master';
 } else {
     message = 'go find another maid fucker';
 }

console.log(message);

var panjang = 7; // atau diameter lingkaran
var lebar = 3;
var tinggi = 0; // tinggi bangun ruang
 
// tinggi = 0;
if(tinggi > 0)
{
console.log('Luas selimut balok: ' + panjang * lebar * tinggi + 'cm');
    console.log('Luas selimut tabung: ' + 2 * 3.14 * (panjang/2) * (panjang/2 + tinggi) + 'cm');
}
else
{
console.log('Luas persegi: ' + panjang * lebar + 'cm');
    console.log('Luas lingkaran: ' + 0.25 * 3.14 * (panjang*panjang) + 'cm');
}

console.log('Nilai: ');
 
var skor = 13;
if(skor < 25)
{
    console.log('D');
}
else if(skor < 50)
{
    console.log('C');
}
else if(skor < 80)
{
    console.log('B');
}
else
{
    console.log('A');
}

var matematika = 13;
var wawancara = 'A';
 
if(matematika > 60) {
    var keterangan = 'Lolos tes, dengan predikat ';
    if(wawancara == 'A') {
        console.log(keterangan + 'Memuaskan');
    } else if(wawancara == 'B') {
        console.log(keterangan + 'Cukup');
    } else {
        console.log(keterangan + 'Tidak lolos tes');
    }
} else {
    console.log('nilai anda kurang mencukupi');
}

var binatang = 'ayam';
switch(binatang)
{
    case 'ayam':
    case 'sapi':
    case 'kambing':
      console.log(binatang + ' termasuk hewan herbivora');
        break;
    case 'serigala':
    case 'harimau':
      console.log(binatang + ' termasuk hewan karnivora');
        break;
    case 'tikus':
      console.log(binatang + ' termasuk hewan omnivora');
        break;
    default:
      console.log(binatang + ' tidak terdaftar di program');
      break;
}

var hero = ['bristleback', 'chaos knight', 'venomancer'];

for (hr = 0; hr < hero.length; hr++)
console.log((hr + 1) + " " + " " + hero[hr]);

//array paprika tidak di print karena tertimpa array index 4 'sawi'
var sayuran = ['kangkung', 'bayam', 'kol', 'paprika'];
sayuran[0] = 'selada';
sayuran[3] = 'brokoli';
console.log('Output: ');
sayuran[4] = 'sawi';
console.log(sayuran)

var kuliner = {
  makanan: 'sate',
  negara: 'indonesia',
}
console.log(kuliner)

var herbivora = new Array('kerbau', 'sapi');
var karnivora = new Array('harimau', 'serigala');
var omnivora = new Array('ayam', 'monyet');
var binatang = new Array(herbivora, karnivora, omnivora);
 
// Isi Array `binatang`
console.log('Binatang: ');
console.log(binatang);

console.log('array :')
console.log(binatang[0])

console.log('jumlah array binatang')
console.log(binatang.length)
console.log('jumlah array binatang[0] : ' + binatang[0].length + " => " + binatang[0]);
console.log('jumlah array binatang[1] : ' + binatang[1].length + " => " + binatang[1]);
console.log('jumlah array binatang[2] : ' + binatang[2].length + " => " + binatang[2]);

console.log('perulangan while')

var whi = 1;
while(whi <= 10)
{ 
    console.log( whi);
    whi++;
}

console.log('perulangan do while ');

var dowhi = 0;
do
{
    console.log( dowhi );
    dowhi++;
}
while(dowhi < 10);

console.log('perulangan for ++ 2');

var forpl;

for (forpl = 0; forpl <= 10; forpl++) {
    console.log('nomor : ' + forpl++);
}

console.log('perulangan for -- 2');

var forpl;

for (forpl = 10; forpl >= 0; forpl--) {
    console.log('nomor : ' + forpl--);
}

console.log('foreach')
var pulau = new Array('papua','nusa tenggara','maluku','sulawesi','kalimantan');
pulau.forEach(function(value, index)
{
    console.log('Indeks ke-' + index + ' adalah pulau ' + value);
});

//nested foreach
var herbivoras = new Array('kambing', 'sapi', 'kuda');
var karnivoras = new Array('harimau', 'serigala', 'anjing');
var omnivoras = new Array('ayam', 'monyet', 'beruang');
var binatangss = new Array(herbivora, karnivora, omnivora);

binatangss.forEach(function(jeniss)
{
  jeniss.forEach(function(namas)
  {
    console.log(namas);
  });
})