Software Engineering
11 Sep 2026
9 min read
Composed Method: Keep Each Routine at One Level of Abstraction
Composed Method: Keep Each Routine at One Level of Abstraction A routine becomes hard to read when it mixes two different jobs: describing a process and implementing every mechanical detail of that process. Consider an order checkout function that validates the cart, calculates a total, writes SQL, formats an email, and records metrics in one long block. A reader must move constantly between business intent and low-level mechanics. The code may be correct, yet its structure hides the story of the operation.