javascript key exists

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Fabian
09 Jul 2017
1var person={"name":"Billy","age":20}
2person.hasOwnProperty("name"); // true
3person.hasOwnProperty("sex"); // false
source
Michele
06 Feb 2018
1if (obj.hasOwnProperty("key1")) {
2  ...
3}
source
Matilda
27 Jul 2016
1"key" in obj // true, regardless of the actual value
2
3If you want to check if a key doesn't exist, remember to use parenthesis:
4!("key" in obj) // true if "key" doesn't exist in object
5!"key" in obj   // ERROR!  Equivalent to "false in obj"
6
7Or, if you want to particularly test for properties of the object instance (and not inherited properties), use hasOwnProperty:
8obj.hasOwnProperty("key") // true
source
Mads
28 Sep 2020
1"key" in obj // true, regardless of the actual value
source
Leelou
28 May 2016
1!("key" in obj) // true if "key" doesn't exist in object
2!"key" in obj   // ERROR!  Equivalent to "false in obj"
3
source
Kailey
02 Oct 2018
1var obj = { key: undefined };
2obj["key"] !== undefined // false, but the key exists!
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