Added loops

README.md

@@ -596,10 +596,17 @@ done
 ## Loop over an array with an index.
 
 ```shell
+arr=(apples oranges tomatoes)
+
 # Elements and index.
 for i in "${!arr[@]}"; do
     printf '%s\n' "${arr[$i]}"
 done
+
+# Alternative method.
+for ((i=0;i<${#arr[@]};i++)); do
+    printf '%s\n' "${arr[$i]}"
+done
 ```
 
 ## Loop over the contents of a file.