program-to-interface-not-implementation

Status: IN

The GoF's first principle of reusable OO design is 'Program to an interface, not an implementation': declare variables in terms of abstract class interfaces, not concrete classes.

Source: entries/2026/06/17/gof-oo-chunk-3.md

Depended on by

• abstract-coupling-enables-pattern-flexibility
• dip-enables-ocp
• gof-two-principles-ground-composition-paradigm-prerequisites
• lsp-enables-abstraction-dependence

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