check if a key exists in an object javascript

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showing results for - "check if a key exists in an object javascript"
Bernardo
29 Mar 2020
1var person={"name":"Billy","age":20}
2person.hasOwnProperty("name"); // true
3person.hasOwnProperty("sex"); // false
Lorenzo
12 Apr 2019
1if (obj.hasOwnProperty("key1")) {
2  ...
3}
Marie
17 Jul 2018
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
Elias
13 Mar 2017
1"key" in obj // true, regardless of the actual value
Anna
19 Jan 2017
1!("key" in obj) // true if "key" doesn't exist in object
2!"key" in obj   // ERROR!  Equivalent to "false in obj"
3
Jarrod
03 Nov 2019
1var obj = { key: undefined };
2obj["key"] !== undefined // false, but the key exists!
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