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Ensures a function is called only once.
Utilizing a closure, use a flag,
called, and set it to
true once the function is called for the first time, preventing it from being called again. In order to allow the function to have its
this context changed (such as in an event listener), the
function keyword must be used, and the supplied function must have the context applied.
Allow the function to be supplied with an arbitrary number of arguments using the rest/spread (