control_flow.md

Overview

• Control flow structures & idioms

Conditional

1. Simple example

if x < 3 {
    return z
}

1. Compound example, checks for error

if err := file.Chmod(0755); err != nil {
    return err
}

Loops (iteration)

1. Like a while

for shouldContinue {
  // ...
}

1. Run until explicit exit

for {
    // ...
    // break or return
}

1. Fixed iterations

for i := 0; i < 10; i++ {
  // ...
}

1. Map iteration: See maps doc
2. Slice iteration: See slices doc

Switch

1. No automatic fall thru
2. General switch, alternative to if-elseif chains

switch {
case isBlue && isAlive:
    return "smurf"
case isYellow && isAlive:
    return "minion"
}

• TODO: switch on enum
• TODO: switch on character
• TODO: switch on number
• TODO: switch on string
• TODO: type switch
• TODO: switch: multiple cases (comma separated)

Idioms

1. Rarely use else, use multiple returns instead

Other Resources

1. https://gobyexample.com/if-else
2. https://gobyexample.com/for