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The error arises because the @racket[em] function is getting three arguments — @code{"RacketCon " "BOOM" " year"} — but has been defined to only accept one argument, @racket[word]. This is the ``arity mismatch.''
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The error arises because the @racket[em] function is getting three arguments — @code{"RacketCon " '(strong "this") " year"} — but has been defined to only accept one argument, @racket[word]. This is the ``arity mismatch.''
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To fix this, it's better to get in the habit of writing tag functions that accept an indefinite number of input values. You do this by defining your function with a @italic{@seclink["contracts-rest-args" #:doc '(lib "scribblings/guide/guide.scrbl")]{rest argument}} (as in, ``give me the rest of the input values.'') To use a rest argument, put it last in your list of input arguments, and add a period @litchar{.} before:
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To fix this, it's better to get in the habit of writing tag functions that accept an indefinite number of input values. You do this by defining your function with a @italic{@seclink["contracts-rest-args" #:doc '(lib "scribblings/guide/guide.scrbl")]{rest argument}} (as in, ``give me the rest of the input values.'') To use a rest argument, put it last in your list of input arguments, and add a period @litchar{.} before:
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