Comment by sapiogram
1 day ago
No, that's a mistake in the article. The variable is still captured by reference, but `let` is causing it to be re-declared on every iteration of the loop, not mutated.
The following code prints 1, 2, 3. It wouldn't do that if the variable was captured by value.
for (let i = 0; i < 3;) {
setTimeout(() => console.log(i));
i++;
}
The behavior of "let" with for loops where the variable is declared more times than it is initialized, despite the source code having one declaration that is also the only initialization, is not very explicit.
Fair, but that's a property of for loops. Variable in closures are still always captured by reference.