Why is a variable declared inside a loop not considered an error?

Question

JavaScript

If you declare any variable, and after it declare another variable with the same name, then there will be an error (Identifier 'max' has already been declared)

let max;
let max;

But if you declare a variable inside the loop, then no error will occur.

for (let i = 0; i < 10; i++) {
  let max;
  console.log(i);
}

Why? The loop, on the other hand, repeats the sequence of actions specified in the code block, and therefore re-declares the variable, but no error occurs.

About the question

Да, возможно вопрос глупый, но ответа в интернете я на него не нашел, поэтому прошу просто ответить на него. Спасибо

Answer 1

let and const act up to the nearest brackets, new brackets - new context

Answer 2

You would write what kind of language, but there are rules: curly braces define a block, and inside the block a new level of nesting and local variables, i.e. a local variable is not related to an external variable of the same name.
You can try like this:

let max;
{let max;}