Answers for "know if key exist js"

16

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
0

how to check if a key is present in a dictionary in js

var obj = { key: undefined };
obj["key"] !== undefined // false, but the key exists!
Posted by: Guest on August-14-2021

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