how to check if a key is present in a dictionary in js

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showing results for - "how to check if a key is present in a dictionary in js"
Amaury
28 Oct 2019
1"key" in obj // true, regardless of the actual value
2
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Eric
25 Apr 2019
1var obj = { key: undefined };
2obj["key"] !== undefined // false, but the key exists!
3
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