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Output: logging a var and a let before their declarations

EasyP1Output

What does this code print?

1console.log(a);
2var a = 1;
3console.log(b);
4let b = 2;
5console.log('done');

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One line per console.log. Arrays as [1, 2, 3], objects as { a: 1 }, an uncaught error as Uncaught TypeError: message (Chrome and Node wording).

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