metaExpr: Mark an expression as a meta-expression

In rstudio/shinymeta: Export Domain Logic from Shiny using Meta-Programming

Mark an expression as a meta-expression

Description

Mark an expression as a meta-expression

Usage

metaExpr(
  expr,
  env = parent.frame(),
  quoted = FALSE,
  localize = "auto",
  bindToReturn = FALSE
)

Arguments

expr	An expression (quoted or unquoted).
env	An environment.
quoted	Is the expression quoted? This is useful when you want to use an expression that is stored in a variable; to do so, it must be quoted with quote().
localize	Whether or not to wrap the returned expression in local(). The default, "auto", only wraps expressions with a top-level return() statement (i.e., return statements in anonymized functions are ignored).
bindToReturn	For non-localized expressions, should an assignment of a meta expression be applied to the last child of the top-level ⁠\{⁠ call?

Value

If inside meta mode, a quoted form of expr for use inside of metaReactive2(), metaObserve2(), or metaRender2(). Otherwise, in normal execution, the result of evaluating expr.

See Also

metaReactive2(), metaObserve2(), metaRender2(), ..

rstudio/shinymeta documentation built on April 12, 2025, 7:36 p.m.