var dot2val = require('dot2val');

var obj = {
    prop1: {
        arr: ['a', 'b', 'c']
      , str: 'Hello'
    }
  , prop2: {
        arr: [ { nested: 'Universe' } ]
      , str: 'Hello again!'
    }
}
var arr = [ { foo: 'bar' } ];

dot2val.get(obj, 'prop1.str'); // => "Hello"
dot2val.get(obj, 'prop1.arr.2'); // => "c"
dot2val.get(obj, 'prop2.arr.0.nested'); // => "Universe"
dot2val.get(arr, '0.foo'); // => "bar"
dot2val.get(undefined, 'doesnt.matter'); // => undefined
dot2val.get({}, 'doesnt.exist'); // => undefined
dot2val.get({}, 'doesnt.exist', 'default value'); // => "default value"

dot2val.set(obj, 'hello.universe', 'properties');
dot2val.set(obj, 'hello1', 'universe');
dot2val.set(obj, 'prop2');        // delete obj['prop2']