Go iota

Go has an interesting feature called iota. When declaring a list of constants, this keyword represents successive untyped integer constants.

const (
    foo = iota  // foo == 0
    bar = iota  // bar == 1
    baz = iota  // baz == 2
)

Anytime const is invoked, the counter resets.

const foo = iota  // foo == 0
const bar = iota  // bar == 0

This is a cool way to quickly define a list of integer constants, such as 'true' and 'false', for later use.