Answers for "javascript object check if key exist"

javascript does key exist

var person={"name":"Billy","age":20}
person.hasOwnProperty("name"); // true
person.hasOwnProperty("sex"); // false

Posted by: Guest on July-22-2019

check if a key exists in an object javascript

"key" in obj // true, regardless of the actual value

Posted by: Guest on March-30-2020

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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