Learning Flash Lite 1.x ActionScript 
Learning Flash Lite 1.x ActionScript |
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| Flash 4 ActionScript Primer > Using the eval() function | |||
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The eval() function lets you dynamically reference variables and movie clip instances at runtime. The eval() function takes a string expression as a parameter and returns either the value of the variable represented by that expression or a reference to a movie clip.
For example, the following code evaluates the value of the name ActionScript variable and assigns the result to nameValue:
name = "Jack";
nameValue = eval("name");
// result: nameValue = "Jack"
The eval() function is often used with for() loops and the add (string concatenation) operator to create string-based arrays, because Flash Lite doesn't support native array data structures. For more information, see Emulating arrays.
You can also use eval() to reference movie clip instances by name. For example, suppose you had three movie clips named clip1, clip2, and clip3. The following for() loop increments the x position of each clip by 10 pixels:
for(index = 1; index <= 3; index++) {
eval("clip" add index)._x += 10
}
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