/swiftExtention

collecting Swift extention

Swift extension collection

Contents

String extension

String 범위 출력

extension String {
    subscript(r: Range<Int>) -> String {
        let start = self.index(self.startIndex, offsetBy: r.lowerBound)
        let end = self.index(self.startIndex, offsetBy:  r.upperBound)
        
        return String(self[start..<end])
    }
}

let str = "iOS Developer"

print(str[0..<3])   // iOS
print(str[4..<str.count]) // Developer

String 해당범위 나누기 -> Array

extension String {
    func split(at index: Int) -> [String] {
        let pivot = self.index(self.startIndex, offsetBy: index)
        let u = self.prefix(upTo: pivot)
        let v = self.suffix(from: pivot)
        
        return [String(u), String(v)]
    }
}

let str: String = "123456"
var arr: [String] = str.split(at: 3)
//["123", "456"]

Array extension