withVisible: Return both a value and its visibility
In robertzk/monadicbase: The R Base Package

Description Usage Arguments Details Value See Also Examples

This function evaluates an expression, returning it in a two element list containing its value and a flag showing whether it would automatically print.

1	withVisible(x)

`x`	An expression to be evaluated.

The argument is evaluated in the caller's context.

This is a primitive function.

`value`	The value of `x` after evaluation.
`visible`	logical; whether the value would auto-print.

invisible, eval

x <- 1
withVisible(x <- 1)
x
withVisible(x)

# Wrap the call in evalq() for special handling

df <- data.frame(a = 1:5, b = 1:5)
evalq(withVisible(a + b), envir = df)