expression is
an
type
The is an
operator evaluates to true
if the given value can be converted to the given type. If the given value cannot be converted to the given type, the is an
operator evaluates to false
.
In HyperTalk, you can only use is an
to test if some value is an integer
, a number
, a date
, a point
, or a rectangle
. However, the test for a date
will accept just about any string to the point of being nearly useless, and the tests for point
and rectangle
are broken: if the value is not a comma-delimited list of integers, the expression will trigger an "Expected integer here" script error instead of evaluating to false
. XION will only consider something a date
if it can actually be converted to one, and will never trigger a script error when evaluating the is an
operator.
are
, instanceof
, is a
, isa