Functions & Multiple Returns

Declaring functions, parameters, multiple return values, named returns, and variadic arguments.

Real-World Analogy (Mental Model)

“A vending machine with a dual-tray slot: you input money, and it drops your snack in tray 1 and your receipt/change in tray 2 at the exact same moment.”

Key Concepts & Rules To Remember

Functions can return multiple values simultaneously.
Variadic functions (`...T`) accept arbitrary numbers of arguments.
First-class citizens: can be assigned to variables and passed to other functions.

Step-by-Step Code

1. Understanding Functions & Multiple Returns

Declaring functions, parameters, multiple return values, named returns, and variadic arguments. In Go, functions & multiple returns is designed around clarity and high runtime efficiency.

example.goGo 1.24+

func divide(a, b float64) (float64, error) {
    if b == 0 { return 0, errors.New("cannot divide by zero") }
    return a / b, nil
}

Common Beginner Pitfalls & Mistakes

Mistake: Misusing functions & multiple returns without understanding its memory or concurrency semantics.

✅ Correct Way: Always follow standard Go idioms and verify with tests.

Self Assessment

Knowledge Check

Verify your understanding with these interactive practice questions.

Quizzes

Quick checks for understanding

Multiple-choice with inline explanations—expand to see why.

What is the primary concept behind Functions & Multiple Returns?

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