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lang-swift
[[[1, 2], [5, 6]], [[3, 4], [5, 6]]]in my playground.let newArray = array.map { [$0, [5,6]]}where$0is an element of array, ie its first element is[1,2]then its second is[3,4]. You don't need to writeinner inbecause the compiler is smart enough to know there is a parameter and also doesn't care of its name. if there were two parameters then you would have$0&$1. Also the closure is smart enough to know that you are returning something so you also don't need to specify that. Swift is super swift!