[removed] How do constantly monitor variables value

Question

How do I constantly check a variables value. For example:

if(variable == \'value\'){
    dosomething();
}

This would work if I constantly loope

Answer 1

As @Pekka commented, you can have a timer constantly poll the variable. A better solution, if it's all your code that's changing the variable, is to not just set the variable directly, but rather have all setters call a function. The function could then set the variable and do any additional processing you need.

function setValue(value) {
    myVariable = value;
    notifyWatchers();
}