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Documentation fixes for paste.Rd and substr.Rd #223

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Documentation fixes for paste.Rd and substr.Rd #223

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a58345a
Doc: Clarify paste0 efficiency and substr zero-length behavior
aakritixyz Jan 1, 2026
b575051
Clarify examples: recycle0 behavior and zero-length vs empty strings
aakritixyz Jan 6, 2026
e169af0
Remove redundant recycle0/collapse examples from paste.Rd
aakritixyz Jan 6, 2026
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3 changes: 2 additions & 1 deletion src/library/base/man/paste.Rd
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Expand Up @@ -46,7 +46,8 @@ paste0(\dots, collapse = NULL, recycle0 = FALSE)
desirable, e.g.\sspace{}in \code{paste("the value of p is ", p)}.

\code{paste0(\dots, collapse)} is equivalent to
\code{paste(\dots, sep = "", collapse)}, slightly more efficiently.
\code{paste(\dots, sep = "", collapse)}, slightly more efficiently
as it avoids handling a separator.

If a value is specified for \code{collapse}, the values in the result
are then concatenated into a single string, with the elements being
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4 changes: 4 additions & 0 deletions src/library/base/man/substr.Rd
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Expand Up @@ -98,6 +98,10 @@ substr("abcdef", 2, 4)
substring("abcdef", 1:6, 1:6)
## strsplit() is more efficient ...

## Extraction behavior from zero-length strings and empty strings
substr(character(0), 1, 2) # returns character(0)
substring(c("abc", ""), 2) # returns "bc" and ""

substr(rep("abcdef", 4), 1:4, 4:5)
x <- c("asfef", "qwerty", "yuiop[", "b", "stuff.blah.yech")
substr(x, 2, 5)
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