Discussion on: Optional handmade chaining 🤓

[Felippe Regazio]

Really cool solution, it does look like a charm : )
You can also extract the object value in a functional style with:

const optionalChaining = (obj, str) => (obj && str) && (() => str.split('.').reduce((o, i) => o[i], obj))();

and use like that:

const letters = { a: { b: 'c' } };

optionalChaining(letters, 'a'); // {b: "c"}
optionalChaining(letters, 'a.b'); // 'c'
optionalChaining(letters, 'a.b.e'); // undefined
optionalChaining(letters, 'z'); // undefined

We can also extend the Object prototype to avoid some problems (dont know about how good or bad it could be in terms of design, but its possible):

Object.prototype.optionalChaining = function (str) {
  return str.split('.').reduce((o, i) => o[i], this);
}

const letters = { a: { b: 'c' } };

letters.optionalChaining('a'); // {b: "c"}
letters.optionalChaining('a.b'); // 'c'
letters.optionalChaining('a.b.e'); // undefined
letters.optionalChaining('z'); // undefined

[Marcos Henrique]

Clean and beauty, thanks bro