Answers for "check if value is undefined"

js if not undefined

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

Posted by: Guest on October-23-2019

Javascript check if undefined

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

Posted by: Guest on July-22-2019

check if variable is undefined or null jquery

if (variable == null) {
    // variable is either null or undefined
}

Posted by: Guest on March-18-2020

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

js check if undefined

let foo = undefined
//will return true
typeof foo === 'undefined'

Posted by: Guest on July-15-2020

Code answers related to "check if value is undefined"