urbit/base/pub/doc/hoon/runes/br/brls.md
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[barlus, `|+`, %brls](#brls)
============================
`%iron` gate
`|+` is a synthetic rune that produces a [dry]() [`%iron`]() [gate]()
with sample [`$*(p)`]() and [arm]()s `q`. `|+` is similar to `|=`, but
differs in that its sample cannot be read. It can be thought of as
similar to a private function.
See also
--------
[bartis, `|=`, %brts](#brts)
Produces
--------
Twig: `[%brls p=tile q=twig]`
Sample
------
`p` is a [tile](). `q` is a [twig]().
Tall form
---------
|+ p
q
Wide form
---------
|+(p q)
Irregular form
--------------
None
Examples
--------
~zod/try=> +<:|+(a=@ a)
! -axis.6
! peek-park
! exit
~zod/try=> +<:|=(a=@ a)
a=0
Here we're trying to read the sample, using `+<` of two different kinds
of gates. With `|+` you can see we cause an error, whereas with `|=` our
default sample is `a=0`.
~zod/try=> %.(20 |+(a=@ a))
20
~zod/try=> %.(20 |=(a=@ a))
20
~zod/try=> %.(20 |+(a=@ (add a 12)))
32
Kicking a `|+` gate, however, is the same as `|=`.