check object has key javascript
myObj.hasOwnProperty('key') // it checks object for particular key and not on prototype
Log in, to leave a comment
3
2
"key" in obj // true, regardless of the actual value
If you want to check if a key doesn't exist, remember to use parenthesis:
!("key" in obj) // true if "key" doesn't exist in object
!"key" in obj // ERROR! Equivalent to "false in obj"
Or, if you want to particularly test for properties of the object instance (and not inherited properties), use hasOwnProperty:
obj.hasOwnProperty("key") // true
Thank you!
2
0
3.6
8
if ('key' in myObj)
// better
if (!myObj.hasOwnProperty('key'))
Thank you!
8
0
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