Depends on what you need, but I'd say
({test: undefined}).hasOwnProperty('test')
is better.
They don't produce the same result, since the in operator is going to search for that property in the entire prototype chain, while hasOwnProperty is going to look for that prop only in the context of that object.
in
hasOwnProperty
Nice I didn't know that 'in looks up the chain. Good to know :)
'in
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Depends on what you need, but I'd say
is better.
They don't produce the same result, since the
inoperator is going to search for that property in the entire prototype chain, whilehasOwnPropertyis going to look for that prop only in the context of that object.Nice I didn't know that
'inlooks up the chain. Good to know :)