ifelse true-or-false instruction-list1 
          instruction-list2

Runs the first instruction list if the condition is true. Runs the second instruction list if the condition is false. See if.

Example: 

ifelse colorunder = 15 
       [fd 50]
       [bk 50]

This instruction can be used to get an answer to a question dialog box. If the answer is not empty, it is displayed in a text box. In a procedure, the ifelse instruction can be typed on many lines to add clarity:

to insist
question [Your name please...]
ifelse empty? answer 

[insist]

[settext1 answer]
end