What is the time and space complexity of Get/Set Nested Property?

Time complexity: O(k) where k is the path depth. Space complexity: O(k) for the parsed key array.

Get/Set Nested Property

Easy

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Solution Guide: Get/Set Nested Property

Approach

Parse a dot-notation path (supporting bracket syntax for array indices) into an array of keys. For get, walk the object following each key and return the value or a default. For set, walk and auto-create missing intermediate objects, then assign the value at the final key.

Complexity Analysis

Time: O(k) where k is the path depth
Space: O(k) for the parsed key array

Pattern

Nested Property Access

Why It Works

Converting bracket notation to dot notation with a regex, then splitting on dots, normalizes all path styles into a uniform key array that can be traversed with a simple loop.

Updated Feb 2026