is_lang | R Documentation |
These helpers are consistent wrappers around their base R equivalents. A language object is either an atomic vector (typically a scalar), a name (aka a symbol), a call, or a pairlist (used for function arguments).
is_lang(x) is_name(x) is_call(x) is_pairlist(x) is_atomic(x)
x |
An object to test. |
as_name()
and as_call()
for coercion
functions.
q1 <- quote(1) is_lang(q1) is_atomic(q1) q2 <- quote(x) is_lang(q2) is_name(q2) q3 <- quote(x + 1) is_lang(q3) is_call(q3)
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