Constructor Chaining

Objective

Students must use super() to properly initialize parent class constructors, ensuring proper object initialization in inheritance hierarchies.

Evidence

Using super() to initialize parent class:

• Ghost.js - super(data, gameEnv) call in constructor
• DeathBarrier.js - super(data, gameEnv) call
• SpriteSheetCoin.js - super(data, gameEnv) call

Implementation Details

• super() calls parent class constructor
• Must be first statement in child constructor
• Passes necessary data to parent class
• Ensures parent class initialization runs before child logic
• Parent class sets up base properties (position, velocity, rendering)

Key Concepts

• Constructor chaining with super()
• Initialization order in inheritance
• Parameter passing to parent constructors
• Ensuring parent class properties are initialized