gistfile1.js

// access nested hash data using string
// Usage:
// var hash = {"foo": {"bar": true, "baz": false }};
// getVal(hash, "foo.bar".split(".")); //=> true
// getVal(hash, "foo.baz".split(".")); //=> false
// setVal(hash, "foo.baz".split("."), "hoge"); //=> "hoge"
//     you can also create new keys step by step (same as accessing with array-style)
function getVal(hash, keys) {
    var frst=keys.splice(0,1);
    if(keys.length) {
        return getVal(hash[frst], keys);
    } else {
        return hash[frst];
    }
}
function setVal(hash, keys, value) {
    var frst=keys.splice(0,1);
    if(keys.length) {
        return setVal(hash[frst], keys, value);
    } else {
        return hash[frst] = value;
    }
}