Question

In flex, how to check if a variable exists? I have tried using

if (this['some_variable'] != undefined) {
    //do something
}

There is a run time error saying the property some_variable does not exists. I have checked with null instead of undefined, still the same error.

please help.

[EDIT]

Based on the replies I have used this.hasOwnProperty('variable_name'). I found that its returning true if variable_name is a public but false if its private/protected. How to check for a private variable?

Answer 1

You can use

if (this. hasOwnProperty("some_variable")) {
    //access the variable inside
}