Editing Ternary conditional operator (section)

===R===
The traditional if-else construct in [[R (programming language)|R]] (which is an implementation of [[S (programming language)|S]]) is:

<syntaxhighlight lang="r">
if (a < b) {
  x <- "true"
} else {
  x <- "false"
}
</syntaxhighlight>

If there is only one statement in each block, braces can be omitted, like in [[C (programming language)|C]]:

<syntaxhighlight lang="r">
if (a < b)
  x <- "true"
else
  x <- "false"
</syntaxhighlight>

The code above can be written in the following non-standard condensed way:

<syntaxhighlight lang="r">
x <- if (a < b) "true" else "false"
</syntaxhighlight>

There exists also the function {{code|ifelse}} that allows rewriting the expression above as:

<syntaxhighlight lang="r">
x <- ifelse(a < b, "true", "false")
</syntaxhighlight>

The {{code|ifelse}} function is automatically vectorized. For instance:

<syntaxhighlight lang="rconsole">
> ifelse(c (0, 2) < 1, "true", "false")
[1] "true"  "false"
</syntaxhighlight>