Flash / Flex / ActionScript/String/String — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
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(нет различий)
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Текущая версия на 08:14, 26 мая 2010
Содержание
- 1 Access string method directly from the String value
- 2 Call the toString() method. This method returns the string representation of any type of object if available.
- 3 Call the valueOf() method. The valueOf() method of any class returns the primitive value if one exists:
- 4 Converting a String Object to a Primitive
- 5 Convert string to characters
- 6 Create a String object by simply invoking a property or method of the String class from a primitive string value
- 7 Define string variable
- 8 Newline character, \n, which is the equivalent of pressing the Enter key.
- 9 Pass string variables to a method
- 10 Remove every instance of a particular character
- 11 String.concat( ) appends new values to the end of an existing string
- 12 The escape characters for double and single quotes are \" and \" respectively.
- 13 Use valueOf method to return the value of a string object
- 14 Using toString to convert object to String
Access string method directly from the String value
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
trace("banana".length); // 6
}
}
}
Call the toString() method. This method returns the string representation of any type of object if available.
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
var sTitle:String = new String("ActionScript Bible");
trace(sTitle.toString()); // Displays: ActionScript Bible
//By default, the toString() method of an object is called if you attempt to use it where Flash is expecting a string.
var sTitle:String = new String("ActionScript Bible");
trace(sTitle); // Displays: ActionScript Bible
}
}
}
Call the valueOf() method. The valueOf() method of any class returns the primitive value if one exists:
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
var sTitle:String = new String("ActionScript Bible");
trace(sTitle.valueOf()); // Displays: ActionScript Bible
}
}
}
Converting a String Object to a Primitive
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
var s: String = "Hello, world!";
trace(s); // Displays: Hello, world!
trace (s .valueOf ()); // Displays: Hello, world!
}
}
}
Convert string to characters
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
var example:String = "a string";
var characters:Array = example.split( "" );
characters.sort( );
for ( var i:int = 0; i < characters.length; i++) {
trace( characters[i] );
}
}
}
}
Create a String object by simply invoking a property or method of the String class from a primitive string value
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
var dToday:Date = new Date();
var sDate:String = new String(dToday.toString());
trace("ActionScript Bible".length); // Displays 18
}
}
}
Define string variable
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
var exampleA:String = "this is a string";
var exampleB:String = "this is also a string";
var exampleD:String = ""; // Empty string
var exampleE:String = "x"; // Single character
var exampleF:String; // Defaults to null when no value is assigned
}
}
}
Newline character, \n, which is the equivalent of pressing the Enter key.
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
var s: String = "Dear Mom, \nThings are swell. I miss you.\nLove, \nMims";
trace(s);
}
}
}
Pass string variables to a method
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
updateChatHistory("Hi", "Joe");
}
private function updateChatHistory( message:String, username:String ):void {
_history += username + ":" + message + "\n";
};
}
}
Remove every instance of a particular character
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
var example:String = "a string";
var characters:Array = example.split( "" );
for ( var i:Number = 0; i < characters.length; i++ ) {
if ( characters[i] == "r") {
characters.splice( i, 1 );
i--;
}
}
trace( characters.join( "" ) );
}
}
}
String.concat( ) appends new values to the end of an existing string
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
var original:String = "original string value.";
var modified:String = original.concat( "now modified." );
trace(modified);
}
}
}
The escape characters for double and single quotes are \" and \" respectively.
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
var s: String = "Bugs says \"What\"s up, doc?\"";
trace(s); // Bugs says "What"s up, doc?"
}
}
}
Use valueOf method to return the value of a string object
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
var sTitle:String = new String("wbex.ru");
trace("the" + sTitle.valueOf() + " rocks!");
}
}
}
Using toString to convert object to String
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
var now: Date = new Date();
trace("Today"s date is "+ now.toString ());
}
}
}