Problem
What's the best way to use if and else?
Solution
Use if, if..else if, and if..else if..else
Detailed explanation
Some programming languages use
if..then statements, but ActionScript uses
if..else. It's the same construction. Use
if to test for a particular value or case and then
branch your response according to the value.
For example, you can test whether a variable is a certain value:
if it is, do one thing; if not, do something else. You can also
test for more than one value using
else if as many times as you want. This statement
works for both ActionScript 2 and ActionScript 3.
Test for values equal to 5 or 6; if neither, say so:
var value:Number = 5;
Notice that we need to use == (double equal sign) to test for equality:
if(value == 5) {
trace("value is 5");
}
else if(value == 6) {
trace("value is 6");
}
else {
trace("value is neither 5 nor 6");
}
If you just want to see whether the value is 5 and don't want to
do anything else, you can use an
if statement alone:
var value:Number = 5;
if(value == 5) {
trace("value is 5");
}
If the value is 5, the
trace statement is executed; otherwise, nothing
happens.
Note: You can also use the
case..break construction to test for a specific set of
values.
Recipe originally contributed by
Mike Chambers.
Recipe updated by Dave Jacowitz.
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