7. Stick it Together

Note: In this problem, you’re asked to enter your own APL function, without giving it any arguments. Your function will be checked by the APL Challenge system using several tests to see whether it is correct.

You can create your own function by putting an expression in curly brackets ( {…} ). For example, the expression 10÷2 becomes the function {10÷2}. Within this expression (in our example, 10÷2), any ⍵ (omega, the right-most letter of the Greek alphabet) is replaced by the argument to the right of the closing curly bracket ( } ).

For example, a function that halves its argument could be written {⍵÷2}, so {⍵÷2} 10 gives 5.

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Using what you learnt in problem 6, write a function that takes a text as its argument and joins three stars ('***') in front of it and after it. For example:

      {answer} 'HI'
***HI***

      {answer} 'APL'
***APL***

      {answer} 'HELLO'
***HELLO***

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