How to substitute the number of elements of an array into a bash variable?

Question

bash

Good afternoon.
For example:
There is an array ${{my_array[@]}, data comes to it from a function.
If I write
echo ${{#my_array[@]}
Outputs: 11 The
question is, how can I substitute this number 11 into a variable??
i=${{#my_array[@]} - doesn't roll (

Answer 1

i=`echo ${#my_array[@]}`
echo $i

Answer 2

i=${{#my_array[@]} - doesn't roll (

Too many brackets. Must be
i=${#my_array[@]}