rlang::sym() creates a symbol from a string and
rlang::syms() creates a list of symbols from a
character vector.
rlang::expr() and rlang::quo() quote
one expression. quo() wraps the quoted expression in a quosure.
The plural variants rlang::exprs() and
rlang::quos() return a list of quoted expressions or
quosures.
rlang::enexpr() and rlang::enquo()
capture the expression supplied as argument by the user of the
current function (enquo() wraps this expression in a quosure).
rlang::enexprs() and rlang::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 https://rlang.r-lib.org/ and the Metaprogramming section of Advanced R.