R: Reserved Words in R

Reserved {base} | R Documentation

## Reserved Words in R

### Description

The reserved words in R's parser are

`if` `else` `repeat` `while` `function` `for` `in` `next` `break`

`TRUE` `FALSE` `NULL` `Inf` `NaN` `NA` `NA_integer_` `NA_real_` `NA_complex_` `NA_character_`

`...` and `..1`, `..2` etc, which are used to refer to arguments passed down from a calling function. See the Introduction to R manual for usage of these syntactic elements, and dotsMethods for their use in formal methods.

### Details

Reserved words outside quotes are always parsed to be references to the objects linked to in the ‘Description’, and hence they are not allowed as syntactic names (see `make.names`). They are allowed as non-syntactic names, e.g. inside backtick quotes.

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