How to start parsing expressions sections?

I’m stuck on the first step of the parsing expressions section.
Since the parser is supposed to be a top down recursive parser, I’m wondering if I need to write code for all the steps in the grammar before passing test cases, especially for the string and number literal cases?

Edit: I’m trying not to look at the code given in the textbook as try to solve it independently

Closing this thread due to inactivity. If you still need assistance, feel free to start a new discussion!

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