List

The list is the only structured data type in EDEN. Data items of different types can be grouped to form a list using the list formation operator []. Commas are used to separate the data. The whole list is considered as a single data item. For example, the list

[ 100, 'a', "string", [1,2,3] ]

holds four items: an integer (100), a character ('a'), a string ("string") and a list ([1,2,3]).

There are no list constants in the language. The characteristics of the list data type are:

Different typed data can be stored in the same list. For instance,
```
L = [ 100, 'a', "string", [1,2,3] ];
```
L holds four items: an integer (100), a character ('a'), a string ("string") and a list ([1,2,3]).
The individual items of a list can be accessed randomly by giving the index (an integer expression quoted by []) after the list. The first item is numbered 1 (not zero). For example,

L[1] is the first item of L, i.e. 100 (in the previous example).

L[4][2] is 2
It is illegal to index beyond the current number of items of a list. So L[5] is an error since L has only four items.
The suffix operator # returns the current number of items in the list. In the last example, L# is 4, and L[4]# is 3. For the empty list, []# is 0.
The infix operator // returns the concatenated list of two lists; for example,
```
[1,2,3] // [5,6,7]
```
produces
```
[1,2,3,5,6,7]
```
List-related statements are: append, insert, delete and shift statements.
There are no list constants.

`L[1]`	is the first item of `L`, i.e. 100 (in the previous example).
`L[4][2]`	is 2