as_quosure {rlang}R Documentation

Coerce object to quosure

Description

While new_quosure() wraps any R object (including expressions, formulas, or other quosures) into a quosure, as_quosure() converts formulas and quosures and does not double-wrap.

Usage

as_quosure(x, env = NULL)

new_quosure(expr, env = caller_env())

Arguments

x

An object to convert. Either an expression or a formula.

env

The environment in which the expression should be evaluated. Only used for symbols and calls. This should typically be the environment in which the expression was created.

expr

The expression wrapped by the quosure.

Life cycle

See Also

quo(), is_quosure()

Examples

# as_quosure() converts expressions or any R object to a validly
# scoped quosure:
env <- env(var = "thing")
as_quosure(quote(var), env)


# The environment is ignored for formulas:
as_quosure(~foo, env)
as_quosure(~foo)

# However you must supply it for symbols and calls:
try(as_quosure(quote(var)))

[Package rlang version 0.4.0 Index]