call2

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Create a call

Language objects are (with symbols) one of the two types of symbolic objects in R. These symbolic objects form the backbone of expressions. They represent a value, unlike literal objects which are their own values. While symbols are directly bound to a value, language objects represent function calls, which is why they are commonly referred to as calls.

call2() creates a call from a function name (or a literal function to inline in the call) and a list of arguments.

Usage
call2(.fn, ..., .ns = NULL)
Arguments
.fn

Function to call. Must be a callable object: a string, symbol, call, or a function.

...

Arguments to the call either in or out of a list. These dots support tidy dots features.

.ns

Namespace with which to prefix .fn. Must be a string or symbol.

Life cycle

In rlang 0.2.0 lang() was soft-deprecated and renamed to call2().

In early versions of rlang calls were called "language" objects in order to follow the R type nomenclature as returned by base::typeof(). The goal was to avoid adding to the confusion between S modes and R types. With hindsight we find it is better to use more meaningful type names.

See Also

call_modify

Aliases
  • call2
Examples
library(rlang) # NOT RUN { # fn can either be a string, a symbol or a call call2("f", a = 1) call2(quote(f), a = 1) call2(quote(f()), a = 1) #' Can supply arguments individually or in a list call2(quote(f), a = 1, b = 2) call2(quote(f), splice(list(a = 1, b = 2))) # Creating namespaced calls: call2("fun", arg = quote(baz), .ns = "mypkg") # }
Documentation reproduced from package rlang, version 0.2.0, License: GPL-3

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