iterate-objects-safely

What problem does it solve?

TypeScript's object iteration is tricky: for...in loops expose string keys and can lead to unsafe indexing with obj[k], and structural typing allows extra properties along with potential prototype pollution risks. This guide explains safe patterns for traversing object properties and when to prefer Map over plain objects for stronger type safety.

Core Features & Use Cases

• Safe iteration with Object.entries for any object, with keys as strings and values as unknown.
• Use explicit key lists (as const) to achieve precise, narrow types when keys are known.
• Prefer Map when you need guaranteed type safety and to avoid prototype-related pitfalls.
• Real-world scenarios include config validation, data transformation, and safe data extraction from heterogeneous objects.

Quick Start

Start by replacing for...in loops with Object.entries to safely iterate keys and values over a given object.