<s>
JS++	B-Language
is	O
a	O
proprietary	B-Application
programming	O
language	O
for	O
web	O
development	O
that	O
extends	O
JavaScript	B-Language
with	O
a	O
sound	O
type	O
system	O
.	O
</s>
<s>
It	O
includes	O
imperative	B-Application
,	O
object-oriented	B-Language
,	O
functional	B-Language
,	O
and	O
generic	B-Language
programming	I-Language
features	O
.	O
</s>
<s>
JS++	B-Language
first	O
appeared	O
on	O
October	O
8	O
,	O
2011	O
.	O
</s>
<s>
Since	O
JS++	B-Language
is	O
a	O
superset	O
of	O
JavaScript	B-Language
,	O
declaring	O
types	O
for	O
variables	O
is	O
optional	O
.	O
</s>
<s>
JS++	B-Language
features	O
a	O
type	O
system	O
that	O
is	O
sound	O
.	O
</s>
<s>
JS++	B-Language
is	O
able	O
to	O
efficiently	O
analyze	O
out-of-bounds	B-Data_Structure
errors	I-Data_Structure
at	O
compile	O
time	O
.	O
</s>
<s>
The	O
JS++	B-Language
compiler	O
is	O
available	O
for	O
Windows	B-Application
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
,	O
and	O
Linux	B-Application
.	O
</s>
<s>
The	O
compiler	O
generates	O
JavaScript	B-Language
output	I-Language
.	O
</s>
<s>
JS++	B-Language
integrates	O
with	O
various	O
code	O
editors	O
including	O
Visual	B-Language
Studio	I-Language
Code	I-Language
,	O
Atom	B-Application
,	O
and	O
Sublime	B-Language
Text	I-Language
.	O
</s>
<s>
JS++	B-Language
can	O
be	O
integrated	O
with	O
third-party	O
build	O
tools	O
like	O
Webpack	B-Language
.	O
</s>
