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Setting defalt parameters in Javascript

Learnt something new today. To set default parameters, should no input be given, check if type of variable is undefined. If it is, define default parameters.  Perhaps I have already learnt this but it has left my memory stores. I think this is new information to my brain though. Pretty cool! Thanks to edabit.com , my new favourite site <3 <3 <3
function moodToday(mood) {
mood = typeof mood != 'undefined' ? mood : "neutral"; 
return ("Today, I am feeling " + mood);
}
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