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Purpose of Array.from()

Array.from({ length: 4 }

Array.from({ length: 4 }

Array.from({ length: 4 }

Array.from({ length: 4 }

Hello guys, from mdn docs, mdn, I understood what

Array.from

Array.from

Array.from

Array.from does but when it takes an object as argument what does it do? Can someone explain pls.