lesson
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When you step on the gas pedal in a car, you don't calculate fuel-to-air ratios or manually time spark plugs. You simply press the pedal, and the car accelerates.
In software design, information hiding is the principle of concealing internal data and logic inside a module, exposing only a public interface — the set of accessible methods that outside code can use to interact with it.
📊Interactive diagram
Why do we deliberately hide code that we worked hard to write?
The Power of Loose Coupling
In 1972, computer scientist David Parnas introduced information hiding to solve a massive problem: whenever developers changed one part of a system, other seemingly unrelated parts crashed.
Parnas proved that hiding design decisions reduces coupling — the degree of direct dependency between different software modules.
📊Interactive diagram
How do we draw the line between what is visible and what stays hidden?
Interface vs. Implementation
The interface is a binding contract defining what a module can do, while the implementation defines how it does it behind the scenes.
Consider a simple queue in pseudocode: the interface offers
enqueue(item) and dequeue(), but outside callers never know whether the items are stored in a contiguous array or a linked list.Let's see how modern JavaScript enforces this separation using private class fields.