after del_idx(0,1)=-1, my_array.to_string()=[ ]
after del_idx(0,7)=0, my_array.to_string()=[ ]
after del_idx(0,8)=-1, my_array.to_string()=[ 1, 2, 3, 4, 5, null, 7 ]
+after del_idx(0,6)=0, my_array.to_string()=[ 7 ]
+after adding more entries, my_array.to_string()=[ 7, "s1", "s2", "s3" ]
my_array=
[0]=3
[1]=1
after del_idx(0,1)=-1, my_array.to_string()=[]
after del_idx(0,7)=0, my_array.to_string()=[]
after del_idx(0,8)=-1, my_array.to_string()=[1,2,3,4,5,null,7]
+after del_idx(0,6)=0, my_array.to_string()=[7]
+after adding more entries, my_array.to_string()=[7,"s1","s2","s3"]
my_array=
[0]=3
[1]=1
after del_idx(0,1)=-1, my_array.to_string()=[]
after del_idx(0,7)=0, my_array.to_string()=[]
after del_idx(0,8)=-1, my_array.to_string()=[1,2,3,4,5,null,7]
+after del_idx(0,6)=0, my_array.to_string()=[7]
+after adding more entries, my_array.to_string()=[7,"s1","s2","s3"]
my_array=
[0]=3
[1]=1
after del_idx(0,1)=-1, my_array.to_string()=[]
after del_idx(0,7)=0, my_array.to_string()=[]
after del_idx(0,8)=-1, my_array.to_string()=[1,2,3,4,5,null,7]
+after del_idx(0,6)=0, my_array.to_string()=[7]
+after adding more entries, my_array.to_string()=[7,"s1","s2","s3"]
my_array=
[0]=3
[1]=1