check if a key exists in an object javascript
"key" in obj // true, regardless of the actual valuecheck if a key exists in an object javascript
"key" in obj // true, regardless of the actual valuehow 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"Copyright © 2021 Codeinu
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