`bar | %bar`
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Core construction
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The `|` runes construct [core]()s. In the broadest case you can think of
a core as similar to an object with named properties that can contain
either functions or data.
The `|` runes accept an associative array of names ([++term]()) to
([++foot]()), each pair of which are called an [++arm](), producing one
of the three basic categories of core.
#### The natural, generic core:
[`|%`]() Generic core, with [++arms] generally containing [++twig]()s
#### Doors, generic core with a sample:
##### Gates:
Cores with one arm [`$`], the empty name and which takes a sample
`p`. The closest thing in Hoon to a function.
[`|=`]() [`dry`]() gate, where the [sample]() is typechecked at compile
time. [`|*`]() [`wet`]() gate, where the sample is typechecked at
runtime against its product type.
##### Traps:
Traps reduce to a `|%` with one arm `$`, the empty name. A trap is just
some computation that has been put inside of a wrapper so that it may be
passed around.
[`|.`]() Generic trap. [`|-`]() Trap automatically [kick]ed (called)
after construction.