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02-block-scoped-declarations

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for (let i = 0; i < 5; i++) {
  setTimeout(() => console.log(i), i * 1000);
}

or

for (var i = 0; i < 5; i++) {
  setTimeout((capturedI) => console.log(capturedI), i * 1000, i);
}

or

for (var i = 0; i < 5; i++) {
  ((capturedI) => setTimeout(() => console.log(capturedI), i * 1000))(i);
}