Answers for "how to check whether the variable has been declared javascript"

javascript check if variable exists

if (typeof myVar !== 'undefined') {
    // myVar is defined
}

Posted by: Guest on July-23-2019

checking if var is not defined js

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

Posted by: Guest on August-20-2020

Code answers related to "how to check whether the variable has been declared javascript"