Functions vs Methods in Go: 6 Decision Criteria With Code Examples
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When to use a method (owns the data, needs state, is the domain question), when to use a function (operates across types, is a utility, was incorrectly coupled), and when to move code in both directions. Go gives you two ways to attach behavior to logic: methods (with a receiver) and functions (without). Most languages make this decision for you — if it touches a class, it's a method. In Go, you have to choose. The wrong choice shows up as code issues: a free function that takes a type as its