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.
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JSTests
/
es6
/
miscellaneous_subclassables_Map_is_subclassable.js
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function
test
()
{
var
key
=
{};
class
M extends
Map
{}
var
map
=
new
M
();
map
.
set
(
key
,
123
);
return
map
.
has
(
key
)
&&
map
.
get
(
key
)
===
123
;
}
if
(!
test
())
throw
new
Error
(
"Test failed"
);