javascript check if undefined or null

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

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

} else if(comment === null){

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

}

4.17
6
ViruZX 135 points

                                    // simple check do the job
if (myVar) {
 // comes here either myVar is not null,
 // or myVar is not undefined,
 // or myVar is not '' (empty string).
}

4.17 (6 Votes)
0
4
5

                                    var myVar=null;

if(myVar === null){
    //I am null;
}

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

4 (5 Votes)
0
3.5
6

                                    // simple check do the job
if (myString) {
 // comes here either myString is not null,
 // or myString is not undefined,
 // or myString is not '' (empty).
}

3.5 (6 Votes)
0
4
1
Word Demon 80 points

                                    var myVar=null;<br/><br/>if(myVar === null){<br/>    //I am null;<br/>}<br/><br/>if (typeof myVar === 'undefined'){<br/>    //myVar is undefined<br/>}<br/>

4 (1 Votes)
0
3.63
8
Nipun 110 points

                                    if( typeof myVar === 'undefined' || myVar === null ){
    // myVar is undefined or null
}

3.63 (8 Votes)
0
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