Answers for "js dictionary contains key"

javascript does key exist

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

javascript hashtable contains key

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

js dictionary contains key

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

check if a key exists in an object javascript

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