Answers for "react check if key exists"

javascript hashtable contains key

if (obj.hasOwnProperty("key1")) {
  ...
}

Posted by: Guest on March-01-2020

how to check if a key exists in an object javascript

!("key" in obj) // true if "key" doesn't exist in object
!"key" in obj   // ERROR!  Equivalent to "false in obj"

Posted by: Guest on November-25-2020

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