Create an object out of dot notation

Question

This is a reverse question to this question.

Given an object x={a:1,b:2} and a string c.d=3, modify object x to the following:

Answer 1

I believe dojo's setObject does what you want. If you (understandably) don't want to pull in all of dojo then I would recommend examining their (freely available) source or loading just base (only 4k) via AMD. It looks something like this :

function setObject(name, value, context) {
    var parts=name.split("."), 
    p=parts.pop();
    for(var i=0, j; context && (j=parts[i]); i++){
        context = (j in context ? context[j] : context[j]={});
    }
    return context && p ? (context[p]=value) : undefined; // Object
}

So in your case you would do :

x={a:1,b:2};
setObject("c.d", 3, x);

Warning : unless you only ever deal with trivial cases, I would urge you to still go check out the full dojo implementation, which deals with cases where no context is provided etc.