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We are analyzing https://rlang.r-lib.org/reference/defusing-advanced.html.

Title:
Advanced defusal operators — defusing-advanced • rlang
Description:
These advanced operators defuse R expressions. expr(), enquo(), and enquos() are sufficient for most purposes but rlang provides these other operations, either for completeness or because they are useful to experts. exprs() is the plural variant of expr(). It returns a list of expressions. It is like base::alist() but with injection support. quo() and quos() are like expr() and exprs() but return quosures instead of naked expressions. When you are defusing your own local expressions (by opposition to function arguments where non-local expressions are supplied by your users), there is generally no need to attach the current environment in a quosure. See What are quosures and when are they needed?. enexpr() and enexprs() are like enquo() and enquos() but return naked expressions instead of quosures. These operators should very rarely be used because they lose track of the environment of defused arguments. ensym() and ensyms() are like enexpr() and enexprs() but they throw an error when the defused expressions are not simple symbols. They also support strings which are interpreted as symbols. These functions are modelled on the behaviour of the left-hand side of = and <- where you can supply symbols and strings interchangeably. "foo" <- NULL list("foo" = NULL) enquo0 and enquos0() are like enquo() and enquos() but without injection support. The injection operators !!, !!!, and {{ are not processed, instead they are preserved in the defused expression. This makes it possible to defuse expressions that potentially contain injection operators meant for later use. The trade off is that it makes it harder for users to inject expressions in your function. They have to enable injection explicitly with inject(). None of the features of dynamic dots are available when defusing with enquos0(). For instance, trailing empty arguments are not automatically trimmed.
Website Age:
7 years and 11 months (reg. 2017-07-25).

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Keywords {🔍}

expr, arguments, expressions, enquos, injection, quosure, error, bar, foo, named, false, operators, enquo, exprs, enexprs, true, env, xdfcfcc, myfunction, defuse, null, ignoreempty, unquotenames, names, unnamed, quos, enexpr, defused, ensyms, symbols, empty, ctrailing, homonyms, functionarg, support, quosures, naked, function, users, expression, trailing, ignorenull, checkassign, ensymarg, argument, variants, symbol, rlang, advanced, plural,

Topics {✒️}

advanced operators defuse injection operators meant enable injection explicitly fully unnamed results ignore empty arguments left-hand side warning recommends users injection operators return naked expressions supply symbols my_function3 trailing empty arguments fully unnamed injection support usage enexpr unnamed inputs unnamed elements function arguments supply symbols quosure variants naked expressions naked variants considered empty function parameter minimal names null names duplicated names named arguments explicitly inject defused arguments plural variant local expressions local expressions operators lose track simple symbols support strings strings interchangeably dynamic dots automatically trimmed applying exprs_auto_name curly braces ensures assignments lionel henry hadley wickham site built automatically named treat arguments return quosures defused expressions named = false

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See What are quosures and when are they needed?

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