The only way to truly test if a variable is undefined is to do the following. Remember, undefined is an object in Javascript. To determine if a variable or object property exists, It is good to compare to keyword undefined or you can also check the type of the object to string âundefinedâ. In the following JavaScript code we compare the num to the undefined in both way.
Nuclear waste -- The waste from nuclear power plants will be toxic for humans for more than 100,000 years. Itâs untenable now to secure and store all of the waste from the plants that exist. To scale up to 2,500 or 3,000, let alone 17,000 plants is unthinkable.
An accident could result in dangerous levels of radiation that could affect the health and safety of the public living near the nuclear power plant. Nuclear power plants operate in most states in the country and produce about 20 percent of the nationâs power. Nearly 3 million Americans live within 10 miles of an operating nuclear power plant. Before a Nuclear Power Plant Emergency. The following are things you can do to protect yourself, your family and your property from the effects of a nuclear power plant emergency: 1  Build an Emergency Supply Kit with the addition of plastic sheeting, duct tape and scissors. 2  Make a Family Emergency Plan.