Manually creating block scope~ Popular concepts ~

We saw the four different types of scope. I want to share a small tip regarding the block scope. And precisely when we need to create it on purpose. I rarely see this need, but it is good to know. Check out the following situation:

function test(operation) {
  const message = "In progress.";
  const { message, value } = operation;
  // throws: Identifier 'message' has already been declared
}

message is a constant that we define in the test function scope. We can't destruct the operation argument because there is a naming clash.

The quick fix for that is to create an alias, but we can also solve it by using a block scope.

function test(operation) {
  const message = "In progress.";
  {
    const { message, value } = operation;
  }
}