<s>
In	O
computer	B-General_Concept
programming	I-General_Concept
,	O
a	O
local	O
variable	O
that	O
is	O
assigned	O
a	O
value	O
but	O
is	O
not	O
read	O
by	O
any	O
subsequent	O
instruction	O
is	O
referred	O
to	O
as	O
a	O
dead	B-General_Concept
store	I-General_Concept
.	O
</s>
<s>
Dead	B-General_Concept
stores	I-General_Concept
waste	O
processor	O
time	O
and	O
memory	O
,	O
and	O
may	O
be	O
detected	O
through	O
the	O
use	O
of	O
static	O
program	O
analysis	O
,	O
and	O
removed	O
by	O
an	O
optimizing	B-Application
compiler	I-Application
.	O
</s>
<s>
If	O
the	O
purpose	O
of	O
a	O
store	O
is	O
intentionally	O
to	O
overwrite	O
data	O
,	O
for	O
example	O
when	O
a	O
password	O
is	O
being	O
removed	O
from	O
memory	O
,	O
dead	B-General_Concept
store	I-General_Concept
optimizations	I-General_Concept
can	O
cause	O
the	O
write	O
not	O
to	O
happen	O
,	O
leading	O
to	O
a	O
security	O
issue	O
.	O
</s>
<s>
Java	O
example	O
of	O
a	O
dead	B-General_Concept
store	I-General_Concept
:	O
</s>
<s>
The	O
ArrayList	O
which	O
was	O
created	O
when	O
list	O
was	O
declared	O
will	O
now	O
need	O
to	O
be	O
de-allocated	O
,	O
for	O
instance	O
by	O
a	O
garbage	B-General_Concept
collector	I-General_Concept
.	O
</s>
<s>
JavaScript	O
example	O
of	O
a	O
dead	B-General_Concept
store	I-General_Concept
:	O
</s>
