Word Formation
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The monad ;: can be useful in figuring out what the words are in a sentence. The word formation primitive takes a string as its right argument, splits it into words, and returns a result with each word in a box. For now, don't worry about what the boxes are, just note how visually helpful they are. You'll learn about boxes in later sections.
;: '2 + 3' +-----+ |2|+|3| +-----+ ;: '2.5 + 3e4' +---+-+---+ |2.5|+|3e4| +---+-+---+ ;: 'a =. 1 2 3' +-+--+-----+ |a|=.|1 2 3| +-+--+-----+ ;: 'test + 123 NB. this is a comment' +----+-+---+---------------------+ |test|+|123|NB. this is a comment| +----+-+---+---------------------+ ;: 'def =. ''testing 1 2 3''' +---+--+---------------+ |def|=.|'testing 1 2 3'| +---+--+---------------+
Note that the following are all J words and each goes in its own box:
2.5 3e4 =. 1 2 3 test NB. this is a comment 'testing 1 2 3'
It might surprise you that constants such as 1 2 3 and 'testing 1 2 3' are J words. This is an important point and understanding it is necessary in reading and writing J sentences.
If you are ever puzzled by a J sentence (it could happen), one of the things you can do is apply ;: to it to be sure you know the words. You can then worry about the meanings of those words.
Look up ;: in the NuVoc. The informal name for ;: is word formation.
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