how to make a list of directories bash code example

Example 1: bash make folders according to a list

IFS=','read -ra tokens <<< "$contents"  ## your list

for x in "${tokens[@]}"
do
    mkdir $x
    cd $x
    # so something tough $x.txt 
    cd ..

done

Example 2: bash make folders according to a list

myArray=(A C G U)

triplet_len=${#myArray[@]}

j=0
while [ $j -lt $triplet_len ]
  do
    mkdir ./${triplet[j]}  #create directiroy with name of triplet
    cd ./${triplet[j]}
        # do something
    cd ..
 ((j++))
 done