javascript - Check if nested key exists even if undefined

Trying to figure out what the easiest way to write a
function keyExisits that checks and arbitrarily nested key to
see if it exists in an object and is undefined, vs does not
exisit.

assume this
obj

var obj = {
 a:
            {
 b: 1,
 c: {
 d: 2,
 e:
            undefined

 }

            }
}

In this
object the key a.c.e exists and is
undefined, the key a.c.f does not
exist

so

keyExists(obj, 'a.c.e') ===
            true

keyExists(obj, 'a.c.f') ===
            false

using
lodash/underscore is ok

** UPDATE
**

Lodash has works
exactly like this

itemprop="text">

class="normal">Answer

You can
try following

data-lang="js" data-hide="false" data-console="true"
data-babel="false">

class="snippet-code-js lang-js prettyprint-override">var obj = {a: {b:
1,c: {d: 2,e: undefined}}};

function keyExists(o, key) {

if(key.includes(".")) {
let [k, ...rest] = key.split(".");
return
keyExists(o[k], rest.join("."));
} else if(o) {

return
o.hasOwnProperty(key);
}
return
false;
}

console.log(keyExists(obj, 'a.c.e') ===
true)
console.log(keyExists(obj, 'a.c.f') ===
false)

Note:
The above code will not work if there are any dots in the
key name or you are using []
notation.