Ternary ifelse ( ?: ) in different languages

February 23, 2012

(This article was first published on One Tip Per Day, and kindly contributed to R-bloggers)

  • AWK

$ awk ‘ORS=NR%3?”,”:”\n”‘ student-marks

  • Perl /PHP
$result = ($a > $b) ? $x : $y;

In Per6, use double ? and ! instead.

$result = ($a > $b) ?? $x !! $y;

  • R
ifelse(a>0,a,0) Ternary operator (if?true:false)
  • bash/linux
ternary operator ? : is just short form of if/else
case "$b" in
5) a=$c ;;
*) a=$d ;;
 [[ $b = 5 ]] && a="$c" || a="$d"

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