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Sample Topics
This part provides examples of the use of J in various topics;
it is designed to be used in conjunction with the dictionary
and at the keyboard of a J system.
It is also designed to be used inductively, as follows:
- Read one or two sentences and their results
(which begin at the left margin), and attempt to state clearly
in English what each sentence does.
- Enter similar sentences to test the validity of your statements.
- Consult the dictionary to confirm your understanding of the
meaning of primitives such as i. (used with one argument or two).
Use the Vocabulary at the end of the book as an index to
pages in the dictionary. In the Windows system, highlight a word
(e.g. /:) and hit ctrl-F1 to display the dictionary entry
for that word.
- Enter parts of a complex sentence, such as i. 26
and j+/i.26 in the case of a.{~j+/i.26 used in the topic
Alphabet and Numbers.
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