Answers for "javascript notation to check if key exist in object"

2

how to check if a key exists in an object javascript

!("key" in obj) // true if "key" doesn't exist in object
!"key" in obj   // ERROR!  Equivalent to "false in obj"
Posted by: Guest on November-25-2020
-1

js check if object key exists

var obj = { key: undefined };
obj["key"] !== undefined // false, but the key exists!
Posted by: Guest on July-23-2020

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