Implementing a Dynamic Update Strategy in an Angular Component

This challenge focuses on building a reusable Angular component that dynamically updates its displayed data based on a configurable update strategy. The ability to define different update behaviors (e.g., always update, update only when a specific property changes, update based on a custom function) is crucial for building efficient and responsive Angular applications, especially when dealing with large datasets or frequent data changes.

Problem Description

You are tasked with creating an DynamicUpdaterComponent in Angular that displays a piece of data and updates it based on a provided updateStrategy. The updateStrategy is an object that dictates when the component should re-render. The component should accept an initial data value and an updateStrategy object as inputs. The component should then observe the data and only update its display when the updateStrategy determines it should.

Key Requirements:

• Data Input: The component must accept a data input of type any.
• Update Strategy Input: The component must accept an updateStrategy input of type UpdateStrategy.
• Dynamic Update: The component must only update its display when the updateStrategy evaluates to true.
• Reusability: The component should be designed to be easily reusable with different data types and update strategies.
• Change Detection Optimization: The component should avoid unnecessary change detection cycles.

Expected Behavior:

The component should initially display the provided data. Subsequent changes to the data should only trigger an update if the updateStrategy evaluates to true. If the updateStrategy is not provided, the component should always update.

UpdateStrategy Interface:

interface UpdateStrategy {
  propertyName?: string; // Optional: Property to watch for changes
  condition?: (newData: any, oldData: any) => boolean; // Optional: Custom condition function
}

• propertyName: If provided, the component will only update when the value of this property in the data object changes.
• condition: If provided, the component will only update when this function returns true given the new and old data values. If both propertyName and condition are provided, condition takes precedence.

Examples

Example 1:

Input:
data: { name: "Alice", age: 30 }
updateStrategy: { propertyName: "name" }

Output:
Component displays "Alice" initially.
When data changes to { name: "Bob", age: 30 }, the component updates to display "Bob".
When data changes to { name: "Alice", age: 31 }, the component does *not* update.

Example 2:

Input:
data: { count: 0 }
updateStrategy: { condition: (newData, oldData) => newData.count > oldData.count }

Output:
Component displays 0 initially.
When data changes to { count: 1 }, the component updates to display 1.
When data changes to { count: 1 }, the component does *not* update.
When data changes to { count: 2 }, the component updates to display 2.

Example 3: (Edge Case - No Update Strategy)

Input:
data: { message: "Hello" }
updateStrategy: undefined

Output:
Component displays "Hello" initially.
When data changes to { message: "World" }, the component updates to display "World".

Constraints

• The component must be written in TypeScript.
• The component should be a functional component using hooks (useState, useEffect).
• The component should avoid unnecessary re-renders. Use useMemo and useCallback where appropriate.
• The condition function in the UpdateStrategy should be pure (no side effects).
• The component should handle the case where data is null or undefined gracefully.

Notes

• Consider using useEffect to observe changes in the data and updateStrategy.
• Think about how to efficiently compare data values based on the propertyName or condition.
• The UpdateStrategy interface is provided for clarity; you don't need to create a separate class for it.
• Focus on creating a clean, reusable, and performant component. Prioritize avoiding unnecessary re-renders.
• The component's display should simply show the data value. No complex formatting is required. A simple <div>{data} will suffice.