expr() defuses an R expression with
It is equivalent to
An expression to defuse.
Defusing R expressions for an overview.
enquo() to defuse non-local expressions from function
Advanced defusal operators.
call2() for building expressions (symbols and calls
eval_bare() for resuming evaluation
of a defused expression.
# R normally returns the result of an expression 1 + 1 # `expr()` defuses the expression that you have supplied and # returns it instead of its value expr(1 + 1) expr(toupper(letters)) # It supports _injection_ with `!!` and `!!!`. This is a convenient # way of modifying part of an expression by injecting other # objects. var <- "cyl" expr(with(mtcars, mean(!!sym(var)))) vars <- c("cyl", "am") expr(with(mtcars, c(!!!syms(vars)))) # Compare to the normal way of building expressions call("with", call("mean", sym(var))) call("with", call2("c", !!!syms(vars)))
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