is_call: Predicate for calls
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is_call

R Documentation

Predicate for calls

Predicate for calls

is_call(x, name = NULL, n = NULL, ns = NULL)

`x`	An object to test. Formulas and quosures are treated literally.
`name`	An optional name that the call should match. It is passed to `sym()` before matching. This argument is vectorised and you can supply a vector of names to match. In this case, `is_call()` returns `TRUE` if at least one name matches.
`n`	An optional number of arguments that the call should match.
`ns`	The namespace of the call. If `NULL`, the namespace doesn't participate in the pattern-matching. If an empty string `""` and `x` is a namespaced call, `is_call()` returns `FALSE`. If any other string, `is_call()` checks that `x` is namespaced within `ns`. Can be a character vector of namespaces, in which case the call has to match at least one of them, otherwise `is_call()` returns `FALSE`.