в 09:19, 26 мая 2010

2010-05-26T09:19:13Z

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2010-05-26T08:15:08Z

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==All arguments that have a default value must all be placed last in the order of arguments==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){

}
function storeAddress(name:String, email:String, zip:String = null){
}
}
</source>

==Complex data types, like Array, pass values by reference.==



<source lang="java">

The following data types are passed by value:
String
Number
int
uint
Boolean
Null
void
All other data types are passed by reference.
package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var person:Object = {name:" P Gibbons"};
capitalizeEmployeeName(person);
trace(person.name); // Displays: PETER GIBBONS

}
function capitalizeEmployeeName(employee:Object):void {
if (employee.name != null) {
employee.name = employee.name.toUpperCase();
}
}
}
}
</source>

==Function definition with multiple arguments==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
displayGreeting("Joey", "Good morning.");
}
function displayGreeting(sFirstName:String, sGreeting:String):void {
trace("Hello, " + sFirstName + ". " + sGreeting); //Hello, Joey. Good morning.
}
}
}
</source>

==Handling an Unknown Number of Parameters==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
trace(getAverage(1,2,3));
trace(getAverage(1,2,3,4));
trace(getAverage(1,2,3,4,5));
}
public function getAverage (...numbers) {
var total = 0;

for (var i = 0; i < numbers.length; i++) {
total += numbers [i];
}

return total / numbers.length;
}
}
}
</source>

==Mix the named parameter and unnamed parameters==



<source lang="java">

public function initializeUser (name, ...hobbies) {
}
initializeUser("H", "v", "s");
name is assigned the value "H", and hobbies is assigned the value ["v", "s"].
</source>

==Passing Parameters by Value or by Reference==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var myVariable:Number = 5;
var myVariablePlusOne:Number = incrementByOne(myVariable);
trace(myVariable);
trace(myVariablePlusOne);
}
function incrementByOne(nValue:Number):Number{
nValue++;
return nValue;
}
}
}
// 5
// 6
</source>

==Passing Parameters to a function==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
displayGreeting("Joey"); // Displays: Hello, Joey
displayGreeting("Robert"); // Displays: Hello, Robert
}
function displayGreeting(sFirstName:String):void {
trace("Hello, " + sFirstName);
}
}
}
</source>

==Primitive data types are passed by value==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var effort:Number = 110;
var trimmedPercentage:Number = limitPercentage(effort);

trace(effort, "%");
trace(trimmedPercentage, "%");

}
function limitPercentage(percentage:Number):Number {
percentage = Math.min(percentage, 100);
percentage = Math.max(percentage, 0);
return percentage;
}
}
}
</source>

==Setting Default Values: add an equal sign (=) and the default value after an argument name==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
showGreeting("Mr. Whimsy");
showGreeting();
}
function showGreeting(name:String = "stranger"):void {
trace("Hello, "+ name + ", nice to meet you.");
}
}
}
</source>

==The rest parameter can also be used with other required parameters.==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
// trace(sum()); // throws a runtime error.
trace(sum(1,2,3,4,5)); // Displays: 15
}
function sum(base:Number, ... numbers):Number {
var result:Number = base;
for each (var num:Number in numbers) {
result += num;

}
return result;
}
}
}
</source>

==Using the Rest Argument (...): represents a variable number of arguments as an array followed by a name for that array==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
trace(sum(1,2,3,4,5)); // Displays: 15
}
function sum(... numbers):Number {
var result:Number = 0;
for each (var num:Number in numbers) {
result += num;
}
return result;
}
}
}
</source>

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Flash / Flex / ActionScript/Function/function parameters - История изменений

в 09:19, 26 мая 2010

Admin: 1 версия