My notes: Javascript

Source referensi: http://www.htmldog.com/guides/javascript/

Kemampuan javascript:
1.  Making stuff hapen => cara menggunakan javascript dan konsol
2. Variable dan data => gimana cara membuat variabel dan bagaimana menggunakannya
3. Doing math => menggunakan variabel untuk menyimpan dan menggunakan angka-angka
4. Logic => bener atau salah
5. Conditional =>
6. Looping =>
7. Functions =>
8. Objects => Properti, method. Menginspeksi obyek-obyek.
9. Array => Mengambil elemen, meletakkan elemen itu kembali. Berapa panjang sebuah potongan string?


 2. Variabel and data (declaring, initialization and assignment)
var surname; (declaring only)
surname = "perjuangan9"; (initialization (giving variable first value))
var apples = 5, pears = 1 (declaring ,init, and assignment)
surname = "perjuangan9"
var jumlahBuah = apples + pears

3. Doing math
Math operator: x, /, +, -

4. Logic
Logic operator:

=== Equality
!== not Equal
> Greater than
< Less than
>=  Combined operations
<= Combined operations

Contoh:
123 === 123
True

123 < 231
True

5. Conditional
5.1 If
if (1 > 2) {alert ('Hello!!!!')}
Hello!!!!

5.2 if-else
if (1 < 2) {alert ('Hello!!!!')}
else {alert ('Boo....')}
 Boo....

6. Looping
6.1 While
var i = 0
while (i <9) { alert (i); i = i + 1; }

Usage: while (final expression) {execution}

6.2 For
for (i = 0; i = 9; i = i + 1;) {alert (i);} 

Usage: for (initialization; condition; final expression) {execution}

7. Function
keyword: function and return

var tambah = function (a, b){
return a + b;
};
alert(tambah(1,2))

8. Objects
Please introduce jedi:

Jedi's name = yoda
jedi's age = 899
jedi's talk = alert ("another sky walk...")

var jedi = { name: 'yoda, age: 899, talk: alert ("another sky walk....")}

8.1 Nested objects


9. Array
Array adalah kumpulan data