tour: add range, range pattern

[Yoorkin]

No description provided.

[peter-jerry-ye-code-review]

‼️ This code review is generated by a bot. Please verify the content before trusting it.

Here are three observations from the provided git diff output:

1. Inconsistent Newlines in println Statements:

   • In the file lesson11_for_in_loop/index.mbt, the println("\nfor-in loop:") statement was changed to println("for-in loop:"), removing the leading newline. This change might affect the formatting of the output, especially if this code is part of a larger program where consistent spacing is important. Ensure that this change aligns with the intended output format.

2. Potential Typo in println Statements:

   • In the file lesson4_newtype/index.mbt, the println statements use user_id._ and user_name._. The ._ syntax might be incorrect or misleading, as it suggests accessing an internal field that doesn't exist. It’s likely that the intention was to print the values directly, such as println(id) and println(name). This should be reviewed and corrected if necessary.

3. Redundant Empty Lines:

   • In the file lesson12_range/index.mbt, there are several redundant empty lines at the end of the file (lines 13-15). While this doesn't affect functionality, it’s good practice to remove unnecessary whitespace to keep the code clean and maintainable.

These issues should be addressed to ensure the code is correct, consistent, and easy to read.