رشتهٔ گفتگو Let a = [ ] vs. Let a = [ null ] both are same or not????

To null hum kb dete h jb value pta nhi ho ..right And after performing some function then null ki jgh values aayegi na!!🙄 -------------------------------- To empty array me bhi to value hme pta nhi h..to after performing some function then comes values naa🤔