Java Reference
In-Depth Information
Bitwise shift operators
These work by converting values in
v1
to 32‐bit binary numbers and then moving the bits in the
number to the left or the right by the specified number of places.
naMe
introduced
Meaning
Left‐shift
JavaScript 1.0
v1 << v2
Shifts
v1
to the left by
v2
places, filling the
new gaps in with zeros.
Sign‐propagating
right‐shift
JavaScript 1.4
v1 >> v2
Shifts
v1
to the right by
v2
places, ignoring the
bits shifted off the number.
Zero‐fill right‐shift
JavaScript 1.0
v1 >>> v2
Shifts
v1
to the right by
v2
places, ignoring
the bits shifted off the number and adding
v2
zeros to the left of the number.
logical operators
These should return one of the boolean literals,
true
or
false
. However, this may not happen if
v1
or
v2
is neither a boolean value nor a value that easily converts to a boolean value, such as
0
,
1
,
null
, the empty string, or
undefined
.
naMe
introduced
Meaning
Logical AND
JavaScript 1.0
v1 && v2
Returns
true
if both
v1
and
v2
are
true
, or
false
otherwise. Will not evaluate
v2
if
v1
is
false
.
Logical OR
JavaScript 1.0
v1 ││ v2
Returns
false
if both
v1
and
v2
are
false
, or
true
if
one operand is
true
. Will not evaluate
v2
if
v1
is
true
.
Logical NOT
JavaScript 1.0
!v1
Returns
false
if
v1
is
true
, or
true
otherwise.
