I encountered that proble that I would like to get the 1st array in an array of array.
[1,2,3], [4,5,6], [7,8,9]
And I only want to pick the 1st set, [1,2,3].
I tried for a long time, but it will turn to 1,2,3,4,5,6,7,8,9 and output 1 only.
Could you help to provide some helps? Thanks