7. Reverse Integer.swift

class Solution {
    func reverse(_ x: Int) -> Int {
        let str: String = String(x)
        
        let arr = str.reversed().filter{( $0 != ".")}
        var result: Int
        var resStr: String = ""
        if x == -0 {
            return 0
        }

        for i in 0 ..< arr.count {
            resStr += "\(arr[i])"
        }
        if resStr[resStr.index(resStr.startIndex, offsetBy: resStr.count-1)] == "-" {
            let range = resStr.startIndex ..< resStr.index(before: resStr.endIndex)
            
            
            result = Int(resStr[range]) ?? 0
            result = -result
        } else {
            result = Int(resStr) ?? 0
        }
        
        if result > Int32.max || result < Int32.min {
            result = 0
        }
        
        return result ?? 0
    }
}