From: 7stud -- <lists@...>
Date: 2012-10-03T03:52:09+09:00
Subject: Re: how to read arrary with an array

> array2 = ['a',[1,2],'x']
> a is slot1-0-0, 1 is 1-0, 2 is 1-1, and x is 2-0

No.  Your array has 3 elements (remember commas separate the elements of
an array)

The first element of your array is at index position 0, and it is the
string 'a'.
The second element of your array is at index position 1, and it is the
array [1, 2]
The third element of your array is at index position 2, and it is the
string 'x'.

Once you get a reference to any of those items, you can do whatever that
item's class allows you to do to the item.  So for instance, for either
of the strings you can call the capitalize() method--but you can't call
capitalize() on the array.

Where you seem to be confused is that the String class also allows you
to call the method [] on a String, so a String acts like an array in
that respect.   As a result, you can do this:


data = [
  'hello',
  'world'
]

data.each do |string|
  puts string
  puts string[2]
end

--output:--
hello
l
world
r


But look what happens here:

string = 'a'
p string[1]

--output:--
nil

That's because the String only has a character at position 0, and
position 1 is beyond the end of the String.

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