Get the index of a value in a Bash array

Question

I have something in bash like

myArray=(\'red\' \'orange\' \'green\')

And I would like to do something like

echo ${         


        

Answer 1

This outputs the 0-based array index of the query (here "orange").

echo $(( $(printf "%s\n" "${myArray[@]}" | sed -n '/^orange$/{=;q}') - 1 ))

If the query does not occur in the array then the above outputs -1.

If the query occurs multiple times in the array then the above outputs the index of the query's first occurrence.

Since this solution invokes sed, I doubt that it can compete with some of the pure bash solutions in this thread in efficiency.