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I was following the below logic to check if a variable is undefined or not:
if (variable==undefined){
////implementation
}
But found that for some cases it did not function as expected. So, tried this approach,
if(typeof(variable) == "undefined"){
/////implementation
}
So which one is most reliable?
Your second way is the most reliable but you don’t need the parenthesis for the
typeofoperator. See this question.