Let's look at an example. The letters A B C D are contained within the block [A B C D]. Coming from other programming languages, you may be more used to terms such as lists or arrays. These are very much the same as series. In Red, multidimensional arrays can be represented by nested blocks. If you want a more formal definition, we could say that a series is an ordered set of items, which can be values (data) or words (code). In the preceding example, the items are words such as A B and so on (they are not strings or characters), and they must get a value at some time while running the program. In Red, you can manipulate code as easily as you can manipulate data.
=> Now answer question 1 from the Questions section.
Because a series is ordered, each item in it can be referred to by a number—its index. The index in Red starts counting from 1, so...
