Go switch versus if-else

Direct Answer

Use if or if-else for a small number of unrelated Boolean decisions. Use switch when one value, type, or group of related conditions leads to several named outcomes. They can express the same logic, so readability and maintainability decide the choice.

Deep Dive & Architecture

Go uses if for decisions, for for repetition, and switch for choosing between several related cases.

for is Go's only loop keyword, and a switch stops after the first matching case unless fallthrough is written explicitly.

Use if or if-else for a small number of unrelated Boolean decisions. Use switch when one value, type, or group of related conditions leads to several named outcomes. They can express the same logic, so readability and maintainability decide the choice.

Common mistakes include writing an endless loop accidentally, expecting switch cases to fall through, hiding errors in deeply nested conditions, and misunderstanding variables created inside if or switch. Keep branches shallow, make loop exits visible, and test boundary conditions.

Code Example

switch status {
case Active:
    allow()
case Pending:
    review()
default:
    deny()
}

Common Mistakes & Pitfalls

Claiming that switch is always faster instead of explaining that the compiler and case shape determine implementation details.