Learn To Program

Regex In Javascript

pattern in search. g modifiers treat to all elements matched. i modifiers treat incase-sensitive

anElement.innerHTML = "Indonesia".search(/do/i); // return 4

output> 4

elem.innerHTML = "indonesia".split(/[aiueo]/);

output> ,nd,n,s,, // 6 array elements

elem.innerHTML = /wo/.test("Hello world");    

output> true;

String method for Regex:

1. search(pattern) : index

2. split(pattern)  : array >< match

3. replace(pattern,textReplacer): string

4. match(pattern) : array >< split

var hello = "Hello world";

elem.innerHTML = hello.search(/world/ig);

output> 6

elem.innerHTML = hello.split(/[aiueo]/ig);

output> h,ll, w,rld

elem.innerHTML = hello.replace(/world/,"lady gaga");
output> hello lady gaga

elem.innerHTML = hello.match(/[aiueo]/);

output> e,o,o

String Operation In Javascript

Declare a string variable:

var desc = "Helping others who want to help themself";

To get the length of the string, use:
elem.innerHTML = desc.length;

output> 40

elem.innerHTML = desc.toUpperCase();

output> HELPING OTHERS WHO WANT TO HELP THEMSELF

elem.innerHTML = desc.toLowerCase();

output> helping others who want to help themself

elem.innerHTML = desc.charAt(0);    // char at first index.

output> H

elem.innerHTML = desc.charAt(desc.length-1)); // the last char

output> f

var zero = "indonesia";

var one = " sunday";

var two = " friday";

elem.innerHTML = zero.concat(one, two);    // new string

output> indonesia sunday friday

var hello = "Hello World";

elem.innerHTML = hello.indexOf("Wor");

output> 6

elem.innerHTML = hello.indexOf("WORLD");    // nothing

output> -1

elem.innerHTML = hello.indexOf("o");

output> 4

elem.innerHTML = hello.lastIndexOf("o");

output> 7

var hello = "Hello World";

elem.innerHTML = hello.slice(1);

output> ello World

elem.innerHTML = hello.slice(hello.indexOf("W"));

output> World

var abc = "ABCDE";

elem.innerHTML = hello.substr(2,2);

output> CD

Perl Subroutines

To create a subroutine in Perl, type:

sub hello

{

    print "Hello, World!\n";

}

To call it, type:

&hello;

or

$hello($_);

or

$hello(1+2,$_);

Expressions In JavaFX

Block expression is surrounded by curly bracket:

var total = {

    var value = [1..10];

    var sum = 0;

    for( v in value){

        sum = sum + v;

}

    sum;

}

If Else block:

var a = 4;

if(a>5){

println("4 is greater than 5");

}else{

println("4 is less than 5");

}

Range expression:

var seq = [1..100];

var seq2 = [1..100 step 2];
var seqDesc = [100..1 step -1];

For expression:

var data = [1..100 step 2];

for(d in data){

    println(d);

}

While expression:

var i = 0;

while(i<10){

    println(i);

    i++;

}

JavaFX Sequence

To create a sequence, type:

var names = ["lady gaga","steve jobs","bill gates"];

var ages = [24, 55, 58];

var value = [1..100];
var valued = value[n | n>50]; // greater than 50

To access an element from this sequence, use [ ] operator:
println(names[0]); // print out lady gaga

println(value[70]);

To know how much size of the sequence, use:
println(sizeof names);

Use insert command to insert an element into sequence:

insert "barack obama" into names;

insert "larry page" after names[0];

insert "sergey brin" before names[0];

Use delete command to delete an element from sequence:

delete names[0];                 // delete lady gaga

delete "barack obama" from names;

Reversing sequence elements order:
value = reverse value;

JavaFX Object Literal

To create an object literal, the procedures are:

1. create a class file named Data.fx

    public class Data{

        public var name: String;

        public var city: String;

        public var age: Integer;

        public function setName(name){

            this.name = name;

}

        public function getName(){

            return this.name;

}

}

2. Create a var to Object literal in main program

    var lady = Data{

        name: "Lady Gaga";

        city: "New York";

        age: 24;

}

3. Now you are ready to use it:

    println("Name: {lady.name}");

    println("City: {lady.city}");

    println("Age: {lady.age}");

    lady.setName("Stefani Joanne Angelina Germanotta");

    println(lady.getName()); 

Function In JavaFX

Function concept in JavaFX is so simple like in Javascript:

function hello(name:String){

    println("Hello, {name}!");

}

To call it, use:

hello("Lady Gaga");

Other samples:

function add(x:Integer,y:Integer){

    println("Add: {x} + {y} = {x+y}");

}

function add(x:Integer,y:Integer){

    return x+y;

}