Learn JS
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//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);
});
})
JavaScript
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