Object Property Filtering (Pick)

/**
 * Pick specified properties from object
 * @param obj Target object
 * @param keys Array of properties to keep
 * @returns New object with only specified properties
 */
function pickObject<T extends object, K extends keyof T>(obj: T, keys: K[]): Pick<T, K> {
  return keys.reduce((acc, key) => {
    if (obj.hasOwnProperty(key)) {
      acc[key] = obj[key];
    }
    return acc;
  }, {} as Pick<T, K>);
}

// Usage Example
const user = { id: 1, name: "John", email: "[email protected]", password: "secret" };
const safeUser = pickObject(user, ["id", "name", "email"]);
console.log(safeUser); // { id: 1, name: "John", email: "[email protected]" }