Answers for "how to check if a key is undefined withouut using it javascript"

javascript check if boolean is undefined

if (typeof myFlag !== "undefined") {
  // comes here whether myFlag is true or false but not defined
}

Posted by: Guest on May-02-2020

js check if object key exists

var obj = { key: undefined };
obj["key"] !== undefined // false, but the key exists!

Posted by: Guest on July-23-2020

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