Answers for "javascript how to check variable is undefined"

javascript check for undefined

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

Posted by: Guest on July-22-2019

nodejs check if variable is undefined

if ( typeof query !== 'undefined' && query )
{
  //do stuff if query is defined and not null
}
else
{

}

Posted by: Guest on December-25-2020

check undefined in javascript

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

Posted by: Guest on May-29-2021

undefined javascript check

if(undefinedElement === null) {
	console.log("Element is undefined");
}

Posted by: Guest on March-30-2020

Code answers related to "javascript how to check variable is undefined"