check undefined in javascript

if (typeof myVar !== "undefined") {
    console.log("myVar is DEFINED");
}

4
1
Xupv5 130 points

                                     if (t === undefined) {
    return 'Undefined value!';
  }

4 (1 Votes)
0
4.2
10

                                    if(typeof comment === 'undefined') {

  alert('Variable "comment" is undefined.');

} else if(comment === null){

  alert('Variable "comment" is null.');

}

4.2 (10 Votes)
0
4
10
STN 130 points

                                    if (typeof myVariable === 'undefined'){
    //myVariable is undefined
}

4 (10 Votes)
0
0
0
Mille271 95 points

                                    let id;

if(typeof id === 'undefined') {
    console.log("id is undefined...");
}

0
0
3
1

                                    if (typeof myVariable === 'undefined'){<br/>    //myVariable is undefined<br/>}

3 (1 Votes)
0
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