tidyeval: Tidy eval helpers

In UBESP-DCTV/rexams: Exams check at UBESP

Description

• sym() creates a symbol from a string and syms() creates a list of symbols from a character vector.

• expr() and quo() quote one expression. quo() wraps the quoted expression in a quosure.

  The plural variants rlang::exprs() and quos() return a list of quoted expressions or quosures.

• enexpr() and enquo() capture the expression supplied as argument by the user of the current function (enquo() wraps this expression in a quosure).

  enexprs() and enquos() capture multiple expressions supplied as arguments, including ....

exprs() is not exported to avoid conflicts with Biobase::exprs(), therefore one should always use rlang::exprs().

To learn more about tidy eval and how to use these tools, visit http://rlang.r-lib.org and the Metaprogramming section of Advanced R.

UBESP-DCTV/rexams documentation built on May 16, 2019, 11:04 a.m.