Convert JavaScript string in dot notation into an object reference

Question

Given a JS object

var obj = { a: { b: \'1\', c: \'2\' } }

and a string

\"a.b\"

how can I convert the stri

Answer 1

GET / SET answer that also works in react native (you can't assign to Object.prototype currently):

Object.defineProperty(Object.prototype, 'getNestedProp', {
    value: function(desc) {
        var obj = this;
        var arr = desc.split(".");
        while(arr.length && (obj = obj[arr.shift()]));
        return obj;
    },
    enumerable: false
});

Object.defineProperty(Object.prototype, 'setNestedProp', {
    value: function(desc, value) {
        var obj = this;
        var arr = desc.split(".");
        var last = arr.pop();
        while(arr.length && (obj = obj[arr.shift()]));
        obj[last] = value;
    },
    enumerable: false
});

Usage:

var a = { values: [{ value: null }] };
var b = { one: { two: 'foo' } };

a.setNestedProp('values.0.value', b.getNestedProp('one.two'));
console.log(a.values[0].value); // foo