javascript check if not undefined
snippet in javascript

javascript check if not undefined

user2949

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

javascript check for undefined

user5113

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

checking if var is not defined js

user8444

if(typeof x !== 'undefined'){
  alert("Variable x is defined.");
}

nodejs check if variable is undefined

user4922

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

}

How can I check whether a variable is defined in Node Js

user6260

if (query){
   doStuff();
}