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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