# Example 1
on "Hello World"
    after("Hello ")
    erase("l")
    print()

# Example 2
vertices = Vector<Float>()

on vertices
    add(x)
    add(y)
    add(z)

# Is the same as:
vertices.add(x)
vertices.add(y)
vertices.add(z)

# The expression after the 'on' keyword is guaranteed to be evaluated *once* only.