how to check if object has key javascript
myObj.hasOwnProperty('key') // it checks object for particular key and not on prototypehow to check if object has key javascript
myObj.hasOwnProperty('key') // it checks object for particular key and not on prototypecheck 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"js check if object key exists
var obj = { key: undefined };
obj["key"] !== undefined // false, but the key exists!Copyright © 2021 Codeinu
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