If you want to use global functions and variable dynamically you can use:
window[functionName](window[varName]);
Is it possible to do the same thing for variables in the local scope?
This code works correctly but currently uses eval and I'm trying to think of how else to do it.
var test = function(){
//this = window
var a, b, c; //private variables
var prop = function(name, def){
//this = window
eval(name+ ' = ' + (def.toSource() || undefined) + ';');
return function(value){
//this = test object
if ( !value) {
return eval('(' + name + ')');
}
eval(name + ' = value;')
return this;
};
};
return {
a:prop('a', 1),
b:prop('b', 2),
c:prop('c', 3),
d:function(){
//to show that they are accessible via to methods
return [a,b,c];
}
};
}();
>>>test
Object
>>>test.prop
undefined
>>>test.a
function()
>>>test.a()
1 //returns the default
>>>test.a(123)
Object //returns the object
>>>test.a()
123 //returns the changed private variable
>>>test.d()
[123,2,3]
No, like crescentfresh said. Below you find an example of how to implement without eval, but with an internal private object.
To answer your question, no, there is no way to do dynamic variable lookup in a local scope without using
eval()
.The best alternative is to make your "scope" just a regular object [literal] (ie,
"{}"
), and stick your data in there.Hopefully I'm not over-simplifying, but what about something as simple as using an object?