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54 lines
857 B
Markdown
54 lines
857 B
Markdown
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[wutdot, `?.`, %wtdt](#wtdt)
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============================
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If, else
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`?.`is a synthetic hoon that produces `r` if `p` is yes (`&`, `0`), or
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`q` if `p` is no (`|`, 1). `?.` is sort of like "if not", producing the
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second expression if the loobean is true. `?.` is the inverse of `?:`.
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See also
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--------
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[wutcol, `?:`, %wtcl](#wtcl)
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============================
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Produces
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--------
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Twig: `[%wtdt p=twig q=twig r=twig]`
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Sample
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------
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`p`, `q`, and `r` are [twig]()s.
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Tall form
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---------
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?. p
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q
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r
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Wide form
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---------
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?.(p q r)
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Irregular form
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--------------
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None
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Examples
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--------
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~zod/try=> ?.((gth 1 2) 1 2)
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1
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~zod/try=> ?.(?=(%a 'a') %not-a %yup)
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%yup
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Here we see two common cases of `?.` in the wide form, one uses an
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expression `gth` that produces a loobean and the other [`?=`]() to
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produce one of its cases.
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