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Output: var in a for loop with setTimeout, then the same loop with let

EasyP1Output

What does this code print?

1for (var i = 0; i < 3; i++) {
2  setTimeout(() => console.log('var', i), 0);
3}
4 
5for (let j = 0; j < 3; j++) {
6  setTimeout(() => console.log('let', j), 0);
7}

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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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