Concepts
========



Basic definition
****************
To define a new concept

::

    > def concept hello a as "hello" + a


Note that if the left part of the keyword 'as', the traditional quotes that would surround 'hello' and 'a' are not necessary.
In this example 'a' is a variable, as it appears as variable in the 'as' section (while hello
appears as a string)

You have just defined a concept name 'hello'. Sheerka now can understand

>>> hello kodjo
>>> hello my friend

When you do so, an instance of the concept will be created in memory. In the first case,
it will a variable ``'a'`` filled with the value ``'kodjo'``, in the second case, the variable
will be filled with the value ``'my friend'``


Another example:

::

    > def concept one as 1
    > def concept two as 2
    > def concept a plus b as a + b

That's enough to define the addition

>>> one plus two
3