Merge arrays into one index [duplicate]

I have an array like this:

[
  [{"text1" : "text"1"},{"text2" : "text"2"}],
  [{"text3" : "text"3"},{"text4" : "text"4"}]
]

And I am trying to merge the arrays via spread operator

arr = [...arr];

So I can end up with something like this

[{"text1" : "text"1"},{"text2" : "text"2"},{"text3" : "text"3"},{"text4" : "text"4"}]

But I still can’t merge two arrays. What I am doing wrong in merging the indexes?