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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

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

Thanks

About Array lengths - Kevin Powell - Community