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Some more operators

x instanceof y where y is a class name, returns a boolean value.

delete o.x removes property x from object o, true if succeeds or property did not exist. Does not set the property to undefined. If x refers to an object, that is not deleted.

void discards a result and returns the value undefined. Eg,

  <a href="javascript:void;">Open</a>

which performs the function without trying to link. NB: This shows another way of invoking JavaScript.

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