D3 Examples - Array Subclassing Test

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<!DOCTYPE html>
<html>
  <body><pre><script type="text/javascript">
​
var proto = [];
proto.foo = 42;
if (proto.foo) {
  document.write("Can assign properties to array literals.\n");
} else {
  document.write("Cannot assign properties to array literals.\n");
}
​
if ([].__proto__) {
  document.write("Array literals have a __proto__.\n");
​
  var subclass = [];
  subclass.__proto__ = proto;
  if (subclass.__proto__ === proto) {
    document.write("Can assign __proto__.\n");
  } else {
    document.write("Cannot assign __proto__.\n");
  }
  if (subclass.foo) {
    document.write("Subclasses inherit prototype properties.\n");
  } else {
    document.write("Subclasses do not inherit prototype properties.\n");
  }
} else {
  document.write("Array literals do not have a __proto__.\n");
}
​
    </script></pre></body>
</html>
​
    