Edit it. It recompiles as you type.
The language in one screen
let n = 5 // int let x = 2.5 // num
fn area(w: num, h: num) -> num { return w * h }
if n > 3 and x < 9 { ... } else { ... }
while n > 0 { n = n - 1 }
repeat 4 { forward(50) left(90) }
forward(d) back(d) left(deg) right(deg) move and turn
up() down() goto(x, y) face(deg) lift, lower, jump, aim
color(r, g, b) width(w) 0 to 255, pixels
sin(deg) cos(deg) sqrt(x) abs(x) floor(x) random()
int(x) num(x) print(x)