new_quosure() wraps any R object (including expressions,
formulas, or other quosures) into a quosure,
converts formulas and quosures and does not double-wrap.
as_quosure(x, env = caller_env()) new_quosure(expr, env = caller_env())
An object to convert. Either an expression or a formula.
The original context of the context expression.
The expression wrapped by the quosure.
Like the rest of the rlang package,
as_quosure() are maturing.
as_quosureish() is deprecated as of rlang 0.2.0. This function
assumes that quosures are formulas which is currently true but
might not be in the future.
# as_quosure() converts expressions or any R object to a validly # scoped quosure: as_quosure(quote(expr), base_env())#> <quosure> #> expr: ^expr #> env: 0x7f828b01dd08as_quosure(10L, base_env())#> <quosure> #> expr: ^10L #> env: empty# Sometimes you get unscoped formulas because of quotation: f <- ~~expr inner_f <- f_rhs(f) str(inner_f)#> language ~expr# In that case testing for a scoped formula returns FALSE: is_formula(inner_f, scoped = TRUE)#>  FALSE# With as_quosure() you ensure that this kind of unscoped formulas # will be granted a default environment: as_quosure(inner_f, base_env())#> <quosure> #> expr: ^~expr #> env: 0x7f828b01dd08