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function last(arr) { return arr[arr.length - 1]; } last([1, 2, 3]); //: number last(["a", "b", "c"]); //: string function map(arr, f) { var res = []; for (var i = 0; i < arr.length; ++i) res.push(f(arr[i])); return res; } map([1, 2, 3], function() { return "X"; }); //: [string] map([1, 2, 3], function() { return true; }); //: [bool]