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.. _tables:
=================
Tables
=================
.. index::
single: Tables
Tables are associative containers implemented as pairs of key/value (called slot); values
can be any possible type and keys any type except 'null'.
Tables are squirrel's skeleton, delegation and many other features are all implemented
through this type; even the environment, where "global" variables are stored, is a table
(known as root table).
------------------
Construction
------------------
Tables are created through the table constructor (see :ref:`Table constructor <table_contructor>`)
------------------
Slot creation
------------------
.. index::
single: Slot Creation(table)
Adding a new slot in a existing table is done through the "new slot" operator ``<-``; this
operator behaves like a normal assignment except that if the slot does not exists it will
be created.::
local a = {}
The following line will cause an exception because the slot named 'newslot' does not exist
in the table 'a'::
a.newslot = 1234
this will succeed: ::
a.newslot <- 1234;
or::
a[1] <- "I'm the value of the new slot";
-----------------
Slot deletion
-----------------
.. index::
single: Slot Deletion(table)
::
exp:= delete derefexp
Deletion of a slot is done through the keyword delete; the result of this expression will be
the value of the deleted slot.::
a <- {
test1=1234
deleteme="now"
}
delete a.test1
print(delete a.deleteme); //this will print the string "now"
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