Answers for "javascript check if defined"

javascript check if variable exists

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

Posted by: Guest on July-23-2019

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

check if variable is defined

try:
    thevariable
except NameError:
    print("well, it WASN'T defined after all!")
else:
    print("sure, it was defined.")

Posted by: Guest on May-29-2021

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