How do you redeclare variables in a switch block without an error in js?

If you try to redeclare variables in a switch block then it will cause errors because there is only one block. For example, the below code block throws a syntax error as below,

let counter = 1;
switch (x) {
case 0:
let name;
break;
case 1:
let name; // SyntaxError for redeclaration.
break;
}

To avoid this error, you can create a nested block inside a case clause and create a new block scoped lexical environment.
let counter = 1;
switch (x) {
case 0: {
let name;
break;
}
case 1: {
let name; // No SyntaxError for redeclaration.
break;
}
}