Linda Walsh schreef op 16-02-16 om 04:59:
> w/the slow func being killed by a $() sub process, likely:
Yes, subshells are fatal for performance, particularly on bash.
> my fn2='() { my t="${2:?}[*]"
> my arRE="^($(IFS="|"; echo "${!t}"))$"
> [[ $1 =~ $arRE ]]
> }
> '
(What's "my"? An alias for "local"?)
Try this:
appears_in() {
local IFS="|" val="$1"
shift
[[ "$IFS$*$IFS" == *"$IFS$val$IFS"* ]]
}
if appears_in "somevalue" "${array[@]}"; then do stuff; fi
For anyone reading who may not know, the trick is that "$*" expands to a
single string containing all the positional parameters separated by the
first character of $IFS (or with no separator if IFS is empty, but
that's not useful here).
Of course this function is dependent on none of the elements containing
"|". But this lets you set any separator you want, so you could use a
really unlikely character such as IFS=$'\1'.
- M.
