<s>
Functional	B-Application
reactive	I-Application
programming	I-Application
(	O
FRP	O
)	O
is	O
a	O
programming	O
paradigm	O
for	O
reactive	B-Architecture
programming	I-Architecture
(	O
asynchronous	B-Operating_System
dataflow	B-Application
programming	I-Application
)	O
using	O
the	O
building	O
blocks	O
of	O
functional	B-Language
programming	I-Language
(	O
e.g.	O
</s>
<s>
map	O
,	O
reduce	B-Application
,	O
filter	B-Application
)	O
.	O
</s>
<s>
FRP	O
has	O
been	O
used	O
for	O
programming	O
graphical	B-Application
user	I-Application
interfaces	I-Application
(	O
GUIs	B-Application
)	O
,	O
robotics	O
,	O
games	O
,	O
and	O
music	O
,	O
aiming	O
to	O
simplify	O
these	O
problems	O
by	O
explicitly	O
modeling	O
time	O
.	O
</s>
<s>
The	O
original	O
formulation	O
of	O
functional	B-Application
reactive	I-Application
programming	I-Application
can	O
be	O
found	O
in	O
the	O
ICFP	O
97	O
paper	O
Functional	O
Reactive	O
Animation	O
by	O
Conal	O
Elliott	O
and	O
Paul	O
Hudak	O
.	O
</s>
<s>
Formulations	O
such	O
as	O
Event-Driven	O
FRP	O
and	O
versions	O
of	O
Elm	B-Language
prior	O
to	O
0.17	O
require	O
that	O
updates	O
are	O
discrete	O
and	O
event-driven	O
.	O
</s>
<s>
These	O
formulations	O
have	O
pushed	O
for	O
practical	O
FRP	O
,	O
focusing	O
on	O
semantics	O
that	O
have	O
a	O
simple	O
API	O
that	O
can	O
be	O
implemented	O
efficiently	O
in	O
a	O
setting	O
such	O
as	O
robotics	O
or	O
in	O
a	O
web-browser	B-Application
.	O
</s>
<s>
This	O
inherits	O
all	O
of	O
the	O
difficulties	O
of	O
the	O
original	O
stream	O
I/O	O
system	O
of	O
Haskell	B-Language
.	O
</s>
<s>
The	O
Reactive	O
and	O
Etage	O
libraries	O
on	O
Hackage	B-Library
introduced	O
an	O
approach	O
called	O
push-pull	O
FRP	O
.	O
</s>
<s>
These	O
purely	O
defined	O
streams	O
act	O
like	O
lazy	O
lists	O
in	O
Haskell	B-Language
.	O
</s>
<s>
Yampa	O
is	O
an	O
arrowized	O
,	O
efficient	O
,	O
pure	O
Haskell	B-Language
implementation	O
with	O
SDL	B-Operating_System
,	O
SDL2	O
,	O
OpenGL	O
and	O
HTML	B-General_Concept
DOM	I-General_Concept
support	O
.	O
</s>
<s>
The	O
programming	O
language	O
Elm	B-Language
used	O
to	O
support	O
FRP	O
but	O
has	O
since	O
replaced	O
it	O
with	O
a	O
different	O
pattern	O
.	O
</s>
<s>
reflex	O
is	O
an	O
efficient	O
push/pull	O
FRP	O
implementation	O
in	O
Haskell	B-Language
with	O
hosts	O
for	O
browser/DOM	O
,	O
SDL	B-Operating_System
and	O
Gloss	O
.	O
</s>
<s>
reactive-banana	O
is	O
a	O
target-agnostic	O
push	O
FRP	O
implementation	O
in	O
Haskell	B-Language
.	O
</s>
<s>
netwire	O
and	O
varying	O
are	O
arrowized	O
,	O
pull	O
FRP	O
implementations	O
in	O
Haskell	B-Language
.	O
</s>
<s>
Flapjax	B-Language
is	O
a	O
behavior/event	O
FRP	O
implementation	O
in	O
JavaScript	B-Language
.	O
</s>
<s>
React	O
is	O
an	O
OCaml	B-Language
module	O
for	O
functional	B-Application
reactive	I-Application
programming	I-Application
.	O
</s>
<s>
Dunai	O
is	O
a	O
fast	O
implementation	O
in	O
Haskell	B-Language
using	O
Monadic	O
Stream	O
Functions	O
that	O
supports	O
Classic	O
and	O
Arrowized	O
FRP	O
.	O
</s>
<s>
Stella	O
is	O
an	O
actor-based	O
reactive	B-Architecture
programming	I-Architecture
language	O
that	O
demonstrates	O
a	O
model	O
of	O
"	O
actors	O
"	O
and	O
"	O
reactors	O
"	O
which	O
aims	O
to	O
avoid	O
the	O
issues	O
of	O
combining	O
imperative	O
code	O
with	O
reactive	O
code	O
(	O
by	O
separating	O
them	O
in	O
actors	O
and	O
reactors	O
)	O
.	O
</s>
<s>
TidalCycles	O
is	O
a	O
pure	O
FRP	O
domain	O
specific	O
language	O
for	O
musical	O
pattern	O
,	O
embedded	O
in	O
the	O
Haskell	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
It	O
is	O
worth	O
noting	O
that	O
ReactiveX	B-Application
,	O
popularized	O
by	O
its	O
JavaScript	B-Language
implementation	O
rxjs	O
,	O
is	O
functional	O
and	O
reactive	O
but	O
differs	O
from	O
functional	B-Application
reactive	I-Application
programming	I-Application
.	O
</s>
