Var a = []; a.unshift(1); a.unshift(22); a.shift(); a.unshift(3,[4,5]); a.shift(); a.shift(); a.shift(); The final output for the shift() is

#1

can please explain to me this step by step

#2

Unshift adds element at the start of array and shift removes element from start of array
a.unshift(1) -> [1]
(1 added in array)
a.unshift(22) -> [22, 1]
(22 added in array)
a.shift() -> [1]
(22 removed from array)
a.unshift(3,[4,5]) -> [3, [4, 5], 1]
(3, [4, 5] added in array)
a.shift() -> [ [ 4, 5 ], 1 ]
(3 removed from array)
a.shift() -> [ 1 ]
([4, 5] removed from array)
a.shift() -> []
(1 removed from array)

#3

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