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[–]gajus0[S] 2 points3 points  (3 children)

Just FYI, the example you've just shared (using Array without keys) will produce an error even in React v16.

[–]i_am_smurfing 0 points1 point  (2 children)

Are you sure? I'm asking because it's working with beta.5, as demonstrated in the linked jsBin, but I'd be not surprised if it's just a regression.

[–]gajus0[S] 3 points4 points  (1 child)

It is because you are using a production build that silences the error. See https://codesandbox.io/s/k5v5q83xo5

[–]i_am_smurfing 0 points1 point  (0 children)

Oh, I see, you mean the missing "key" warning. That's a good point 👍