Conditional Branching

The if keyword is is.

Standard form:

is <EXPR> {
  # Code
}

The else keyword is isn't.

Standard form:

is <EXPR> {
  # Code
} isn't {
  # Code
}

The else-if keyword is but.

Standard form:

is <EXPR> {
  # Code
} but <EXPR> {
  # Code
} isn't {
  # Code
}