Reference

This appendix defines the structure of the Karel programming language on a single page.

Base Karel commnds:

move()
turn_left()
put_beeper()
pick_beeper()

Karel program structures:

# Comments can be included in any part # of a program. They start with a # # and include the rest of the line.
def main() :
code to execute

declarations of other functions

Names of the conditions:

front_is_clear()
beepers_present()
beepers_in_bag()
left_is_clear()
right_is_clear()
facing_north()
facing_south()
facing_east()
facing_west()

front_is_blocked() no_beepers_present()
no_beepers_in_bag()
left_is_blocked()
right_is_blocked()
not_facing_north()
not_facing_south()
not_facing_east()
not_facing_west()

Conditions:

if condition:
code run if condition passes

if condition:
code block for "yes"
else:
code block for "no"

Loops:

for i in range( count):
code to repeat

while condition:
code to repeat

Function Declaration:

defname():
code in the body of the function.

Extra Karel Commands:

paint_corner(COLOR_NAME)
corner_color_is(COLOR_NAME)