Answers for "javascript how to check if a variable is defined or not without erro"

checking if var is not defined js

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

Posted by: Guest on August-20-2020

javascript set variable if not defined

var x = (typeof x === 'undefined') ? your_default_value : x;

Posted by: Guest on July-28-2020

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