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showing results for - "how to check if a key exists in an object javascript"
Anna
29 Oct 2019
1var person={"name":"Billy","age":20}
2person.hasOwnProperty("name"); // true
3person.hasOwnProperty("sex"); // falseLeon
06 Apr 2018
1myObj.hasOwnProperty('key') // it checks object for particular key and not on prototype Elizabeth
20 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") // trueCatherine
02 Oct 2016
1!("key" in obj) // true if "key" doesn't exist in object
2!"key" in obj // ERROR! Equivalent to "false in obj"
3similar questions
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