javascript check if not undefined
if (typeof myVar !== "undefined") {
console.log("myVar is DEFINED");
}javascript check if not undefined
if (typeof myVar !== "undefined") {
console.log("myVar is DEFINED");
}javascript typeof undfined
var x;
if (typeof x === 'undefined') {
// these statements execute
}javascript if undefined
if(typeof comment === 'undefined') {
alert('Variable "comment" is undefined.');
} else if(comment === null){
alert('Variable "comment" is null.');
}javascript type of undefined
if (typeof x == 'undefined'){
// instructions
}Copyright © 2021 Codeinu
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