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showing results for - "key in dictionary javascript"
Fabio
29 Aug 2016
1var person={"name":"Billy","age":20}
2person.hasOwnProperty("name"); // true
3person.hasOwnProperty("sex"); // false
source
Caris
23 Aug 2018
1"key" in obj // true, regardless of the actual value
2
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Paula
02 Jul 2018
1"key" in obj // true, regardless of the actual value
source
Dinesh
28 Aug 2019
1!("key" in obj) // true if "key" doesn't exist in object
2!"key" in obj   // ERROR!  Equivalent to "false in obj"
3
source
Erwann
11 Feb 2016
1var obj = { key: undefined };
2obj["key"] !== undefined // false, but the key exists!
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