let

@letDirective

Declares named constants. Each binding is read back by writing {{name}} — a compile-time splice of the value as text, which works anywhere the source is read: prose, attribute values, code bodies. The attribute group IS the bindings, so @let has no attributes of its own and no shorthand form (@let:x is an error). For tables of values, declare a @data dataset instead.

Writing with it:Source style

#Examples

@let(source-note: Johnson & Raven (1973))

As reported in {{source-note}}.

@let(
    sample-size: 240
    site: Baltra
)

We surveyed {{sample-size}} plants on {{site}}.

#Notes

A splice is textual and happens before parsing, so {{…}} is not an element and cannot be styled or nested. A value that changes at render time cannot be spliced — read it with a binding instead.
body and detail are reserved across the constant namespace — inside an @define template they name the use's own {...} and [...] sections. Binding either as a constant is a compile error (D6).