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List[Int] is accumulator, () near List[Int] means that it's an empty List at the beginning; (acc, v) => v:acc is a function that receives accumulator and value from left and than adds this into List - :: operation.
try in console: 5::4::3::2::1::Nil
Reverse a List
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List[Int] is accumulator, () near List[Int] means that it's an empty List at the beginning; (acc, v) => v:acc is a function that receives accumulator and value from left and than adds this into List - :: operation. try in console: 5::4::3::2::1::Nil