Answers for "check if value is defined 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

check if isset variable js

var status = 'Variable exists'

try {
  myVar
} catch (ReferenceError) {
  status = 'Variable does not exist'
}

console.log(status)

Posted by: Guest on November-20-2020

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