Given the following JavaScript:
var someFunction = function(id) {
//do some stuff
var modifyId = function(id) {
//do some stuff
outer.id = id; //is there any way to modify the id variable in the outer scope from here?
}
}
How do you modify the id passed into the outer function scope from within the inner function scope?
Unfortunately you can't. By naming the parameter in the nested function id, you've shadowed the parameter in the outer function. Javascript contains no facility for accessing the shadowed name. The only option is to choose a different name for one of the variables.
No, there isn't. From within a function, there's no way (something weird in Mozilla's code or ES5 aside) to refer to the scope as a context in any explicit way, and there's no way to climb up the lexical scope chain in any direct way.
Good question though.
var someFunction = function(id) {
//do some stuff
var oid = id;
var modifyId = function(id) {
//do some stuff
// you can access the outer id via the oid variable
}
}
But, yes, you should just rename one of the formal parameters.
oid = "BLAH" from the inner function will not change the value of id. If it were an object, both id and oid would point to the same object, which is almost the effect you want (you still couldn't change what object id points to by calling oid = {a:1}
Why can't you just rename one of the variables?
