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About Array lengths

Hi guys I have a question, let's say I got an array. Then I will execute an if statement saying

if(!array.length) return

if(!array.length) return

if(!array.length) return

if(!array.length) return

Now the question, does mean that the arrays length is equal to 0... or null? And is it different if I say

if(array.length === 0) return

if(array.length === 0) return

if(array.length === 0) return

if(array.length === 0) return

Thanks

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