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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