Functions and multiple returns in Go

Go's signature style: values plus an error.

func divide(a, b float64) (float64, error) {
    if b == 0 {
        return 0, errors.New("divide by zero")
    }
    return a / b, nil
}

func sum(nums ...int) (total int) {
    for _, n := range nums {
        total += n
    }
    return
}

How it works

1. Returning (T, error) is the standard shape.
2. Variadic nums ...int accepts any count.
3. A named result lets return stand alone.

Keywords and builtins used here

• error
• float64
• for
• func
• if
• int
• range
• return

The run, in numbers

Lines

13

Characters to type

201

Tokens

62

Three-star pace

90 tpm

At the three-star pace of 90 tokens a minute, this run takes about 41 seconds.

Type this snippet

Step 1 of 6 in Functions, step 10 of 30 in Language basics.

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