javascript string object property chain to actual property

gistfile1.js

function resolve(obj, path) {
    var prop;
    
    path = path.split('.');
    
    while (obj = obj[path.shift()]) {
        prop = obj;
    }

    return prop;
}

resolve(window, 'document.body'); // returns value of window.document.body

I have the "same" on amd-utils/object/get - beware that it is slow (ie. shouldn't be called too often) but it can be useful in cases where you might not know if a certain property exists or not:

var lorem = {ipsum : { bar : 123 }};
console.log( get(lorem, 'ipsum.dolor.amet') ); // undefined
console.log(  lorem.ipsum.dolor.amet  ); // throw ReferenceError: dolor is not defined

It would be useful if JS had something similar (more concise and faster) natively. (similar to CoffeeScript existential Operator)

See also: amd-utils/object/set and amd-utils/object/namespace