Answers for "how to test undefined in javascript"

20

Javascript check if undefined

if (typeof myVariable === 'undefined'){
    //myVariable is undefined
}
Posted by: Guest on July-22-2019
7

javascript if undefined

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

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

} else if(comment === null){

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

}
Posted by: Guest on March-25-2020
1

test undefined js

if (t === undefined) {
    return 'Undefined value!';
  }
Posted by: Guest on July-24-2021
-1

undefined javascript check

if(undefinedElement === null) {
	console.log("Element is undefined");
}
Posted by: Guest on March-30-2020

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