js if not undefined
if (typeof myVar !== "undefined") {
console.log("myVar is DEFINED");
}js if not undefined
if (typeof myVar !== "undefined") {
console.log("myVar is DEFINED");
}javascript if undefined
if(typeof comment === 'undefined') {
alert('Variable "comment" is undefined.');
} else if(comment === null){
alert('Variable "comment" is null.');
}js return undefined on ReferenceError
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