Sample Topics

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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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