<s>
Gosu	O
is	O
a	O
statically	O
typed	O
general-purpose	B-Language
programming	I-Language
language	I-Language
that	O
runs	O
on	O
the	O
Java	B-Language
Virtual	I-Language
Machine	I-Language
.	O
</s>
<s>
Its	O
influences	O
include	O
Java	B-Language
,	O
C#	B-Application
,	O
and	O
ECMAScript	B-Language
.	O
</s>
<s>
Development	O
of	O
Gosu	O
began	O
in	O
2002	O
internally	O
for	O
Guidewire	O
Software	O
,	O
and	O
the	O
language	O
saw	O
its	O
first	O
community	O
release	O
in	O
2010	O
under	O
the	O
Apache	B-Application
2	I-Application
license	I-Application
.	O
</s>
<s>
Gosu	O
began	O
in	O
2002	O
as	O
a	O
scripting	O
language	O
called	O
GScript	B-Language
at	O
Guidewire	O
Software	O
.	O
</s>
<s>
It	O
has	O
been	O
described	O
as	O
a	O
Java	B-Language
variant	O
that	O
attempts	O
to	O
make	O
useful	O
improvements	O
while	O
retaining	O
the	O
fundamental	O
utility	O
and	O
compatibility	O
with	O
Java	B-Language
.	O
</s>
<s>
It	O
was	O
used	O
to	O
configure	O
business	B-Architecture
logic	I-Architecture
in	O
Guidewire	O
's	O
applications	O
and	O
was	O
more	O
of	O
a	O
simple	O
rule	O
definition	O
language	O
.	O
</s>
<s>
In	O
its	O
original	O
incarnation	O
it	O
followed	O
ECMAScript	B-Language
guidelines	O
.	O
</s>
<s>
Guidewire	O
continues	O
to	O
evolve	O
InsuranceSuite	O
through	O
RESTful	O
APIs	O
and	O
Integration	O
Frameworks	O
that	O
can	O
be	O
accessed	O
using	O
Java	B-Language
.	O
</s>
<s>
For	O
instance	O
,	O
declarations	O
follow	O
more	O
along	O
the	O
lines	O
of	O
Pascal	B-Application
with	O
name-first	O
grammar	O
.	O
</s>
<s>
Nominal	O
inheritance	O
and	O
composition	O
via	O
delegation	B-Application
are	O
built	O
into	O
the	O
type	O
system	O
as	O
well	O
as	O
structural	O
typing	O
similar	O
to	O
the	O
Go	B-Application
programming	I-Application
language	I-Application
.	O
</s>
<s>
Gosu	O
classes	O
are	O
also	O
executable	O
a	O
la	O
Java	B-Language
:	O
</s>
<s>
Enhancements	O
let	O
you	O
add	O
additional	O
functions	O
and	O
properties	O
to	O
other	O
types	O
,	O
including	O
built-in	O
Java	B-Language
types	O
such	O
as	O
String	O
,	O
List	O
,	O
etc	O
.	O
</s>
<s>
This	O
example	O
demonstrates	O
adding	O
a	O
print( )	O
function	O
to	O
java.lang.String.Now	O
you	O
can	O
tell	O
a	O
String	O
to	O
print	O
itself:The	O
combination	O
of	O
closures	B-Language
and	O
enhancements	O
provide	O
a	O
powerful	O
way	O
of	O
coding	O
with	O
Collections	O
.	O
</s>
<s>
The	O
overhead	O
of	O
Java	B-Language
streams	O
is	O
unnecessary	O
with	O
Gosu	O
:	O
</s>
<s>
This	O
general-purpose	B-Language
programming	I-Language
language	I-Language
is	O
used	O
primarily	O
in	O
Guidewire	O
Software	O
's	O
commercial	O
products	O
.	O
</s>
