Get

Requirements

• Implement get(object, path, defaultValue = undefined). The path is a dotted string such as user.name, a string with numeric brackets such as users[0].name, or an array of string, number, or symbol keys.
• Traverse only own properties. Missing properties, null/undefined intermediate values, primitive intermediates, and an undefined final value return defaultValue.
• Return existing null, false, 0, and empty-string values unchanged. Preserve object and array references.
• An empty string path or empty key array returns defaultValue. Use an array path for literal keys containing dots, brackets, or an empty string, and for symbol keys.
• Assume valid path syntax. Quoted brackets, escape sequences, negative bracket indices, and prototype traversal are outside scope. Do not mutate the input or the path array.

Examples

Input: get({ user: { name: 'Ada' } }, 'user.name')
Output: 'Ada'

Input: get({ users: [{ name: 'Ada' }] }, 'users[0].name')
Output: 'Ada'

Input: get({ user: null }, 'user.name', 'Guest')
Output: 'Guest'