javascript does key exist

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showing results for - "javascript does key exist"
Benjamín
04 Jan 2017
1var person={"name":"Billy","age":20}
2person.hasOwnProperty("name"); // true
3person.hasOwnProperty("sex"); // false
source
Luis
31 Jul 2018
1if (obj.hasOwnProperty("key1")) {
2  ...
3}
source
Mae
14 Jul 2017
1var obj = { key: undefined };
2obj["key"] !== undefined // false, but the key exists!
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