Checkpoint B

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At this point you should understand:

  • a text file that is a source of sentences is called a script file
  • a script file defines global names
  • how to create a new temporary script file
  • how to save a temporary script file as a permanent file
  • how to run a script file to execute its sentences
  • how to define a verb in a script file
  • how to define the monadic and dyadic cases of a verb
  • the difference between =. and =:
  • the difference between local and global
  • that a locale is a set of global names
  • that there can be more than one locale
  • that the base locale is the one you normally work with

Check your understanding by doing the following exercises:


  • create a new temporary script file
  • in the script define square as a monad that uses *: to square its argument
  • save the script in the user directory with the name square.ijs
  • run the script and test the verb square
  • close J, restart, use load'~/j9.4-user/square.ijs' to run square.ijs and test it (The path description may vary depending on your version of J)


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