[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

If you encapsulate your variable so that the value can only be set by calling a function, it gives you the opportunity to check the value.

function ValueWatcher(value) {
    this.onBeforeSet = function(){}
    this.onAfterSet = function(){}

    this.setValue = function(newVal) {
        this.onBeforeSet(value, newVal)
        value = newVal;
        this.onAfterSet(newVal)
    }
    this.getValue = function() {
        return value;
    }
}

var name = new ValueWatcher("chris");

wacthedName.onBeforeChange = function(currentVal, newVal) {
    alert("about to change from" + currentVal + " to " + newVal);
}

name.setValue("Connor");