Completed Progate Ruby Learning Course II

What i learned

It's a memorandum for myself, so just the main points ...

--Don't forget [] when arranging --The index number of the array starts from 0. (0,1,2 ...) --How to use hash --One of the ways to write a hash "Symbol" --How to write without hash --There are three ways to write a hash, but "abbreviation" is common. --"Nil" = meaning nothing --Use "each statement" for iterative processing in Ruby --Variable names in each statement are often (customarily) in the singular form of array variable names.

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