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← JavaScript
#3 most askedVery commonEasyScope & closures

let vs const vs var

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What are the differences between var, let and const? Which should you use by default?

🔮 Predict the output

for (var i = 0; i < 3; i++) {
  setTimeout(() => console.log("var", i), 0);
}
for (let j = 0; j < 3; j++) {
  setTimeout(() => console.log("let", j), 0);
}

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