10Implement get(object, "a.b.c") with a default value

Implement get(object, path, defaultValue), like Lodash's _.get. It reads a nested value by path and returns defaultValue when the value is missing.

const user = { profile: { emails: ["a@x.com", "b@x.com"], age: 0 } };
get(user, "profile.emails[1]"); // "b@x.com"
get(user, ["profile", "age"]); // 0
get(user, "profile.phone.home", "n/a"); // "n/a"

Requirements

• path is a dot string, may use [index] for arrays, or is an array of keys.
• Return defaultValue when the resolved value is undefined, including when a step in the middle is null or undefined.
• Return real falsy values (0, "", false, null) as they are.
• Never throw while walking the path.