javascript check if undefined or null

Solutions on MaxInterview for javascript check if undefined or null by the best coders in the world

showing results for - "javascript check if undefined or null"
Byron
15 Oct 2020
1if( typeof myVar === 'undefined' || myVar === null ){
2    // myVar is undefined or null
3}
Giacomo
23 Apr 2018
1if(typeof comment === 'undefined') {
2
3  alert('Variable "comment" is undefined.');
4
5} else if(comment === null){
6
7  alert('Variable "comment" is null.');
8
9}
Gregory
31 Sep 2017
1var myVar=null;
2
3if(myVar === null){
4    //I am null;
5}
6
7if (typeof myVar === 'undefined'){
8    //myVar is undefined
9}
10
Anna
23 Jan 2020
1var myVar=null;
2
3if(myVar === null){
4    //I am null;
5}
6
7if (typeof myVar === 'undefined'){
8    //myVar is undefined
9}
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