What is the best way to get/set an objects deep property in Javascript?

Question

It is notoriously annoying to get a deeper property from an object. If the parent does not exist, you get an error. So you need to stop getting to the property when a parent doe

Answer 1

Builtin ways, no. If you're in Node.js platform you can try some package like dotty.

Anyway, the way I think you could do it is somewhat like this (I haven't tested it! But I think it could work):

key.split( "." ).reduce(function( memo, part ) {
   if ( typeof memo !== "object" || memo[ part ] === undefined ) {
      return;
   }

   return memo[ part ];
}, obj );