<s>
GNU	B-Application
Smalltalk	I-Application
is	O
an	O
implementation	O
of	O
the	O
Smalltalk	B-Application
programming	I-Application
language	I-Application
by	O
the	B-Application
GNU	I-Application
Project	I-Application
.	O
</s>
<s>
The	O
implementation	O
,	O
unlike	O
other	O
Smalltalk	B-Application
environments	O
,	O
uses	O
text	O
files	O
for	O
program	O
input	O
and	O
interprets	O
the	O
contents	O
as	O
Smalltalk	B-Application
code	O
.	O
</s>
<s>
In	O
this	O
way	O
,	O
GNU	B-Application
Smalltalk	I-Application
acts	O
more	O
like	O
an	O
interpreter	O
rather	O
than	O
an	O
environment	O
in	O
the	O
traditional	O
Smalltalk	B-Application
manner	O
.	O
</s>
<s>
GNU	B-Application
Smalltalk	I-Application
includes	O
bindings	O
for	O
many	O
free	O
software	O
libraries	O
including	O
SQLite	B-Language
,	O
libSDL	B-Operating_System
,	O
cairo	B-Language
,	O
gettext	B-Application
,	O
and	O
Expat	B-Language
.	O
</s>
<s>
These	O
examples	O
work	O
only	O
on	O
GNU	B-Application
Smalltalk	I-Application
3.0	O
and	O
later	O
versions	O
.	O
</s>
<s>
Some	O
basic	O
Smalltalk	B-Application
code	O
:	O
</s>
<s>
Constructing	O
and	O
using	O
a	O
hash	B-Algorithm
:	O
</s>
<s>
Parameter-passing	O
a	O
block	O
to	O
be	O
a	O
closure	B-Language
:	O
</s>
<s>
Returning	O
closures	B-Language
from	O
a	O
method	O
:	O
</s>
<s>
This	O
is	O
analogous	O
to	O
the	O
foldl	B-Application
function	O
in	O
functional	B-Language
programming	I-Language
languages	I-Language
.	O
</s>
