Solve Base64 Encoding 5kyu

5kyu/Base64 Encoding/Base64 Encoding.swift

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+/*
+https://www.codewars.com/kata/5270f22f862516c686000161/train/swift
+
+Base64 Encoding
+
+Extend the String object (JS) or create a function (Python, C#) that converts the value of the String to and from Base64 using the ASCII (UTF-8 for C#) character set.
+
+Do not use built in functions.
+
+Usage:
+
+// should return "dGhpcyBpcyBhIHN0cmluZyEh"
+"this is a string!!".toBase64 
+
+// should return 'this is a string!!'
+"dGhpcyBpcyBhIHN0cmluZyEh".fromBase64
+You can learn more about Base64 encoding and decoding here.
+
+Note: This kata uses the non-padding version ("=" is not added to the end).
+
+*/
+
+extension String {
+    public var toBase64: String {
+        return Data(self.utf8).base64EncodedString()
+    }
+
+    public var fromBase64: String {
+        guard let data = Data(base64Encoded: self) else { return "" }
+        guard let str = String(data: data, encoding: .utf8) else { return "" }
+        return str
+    }
+}
+
+/*
+
+Sample Tests
+
+import XCTest
+class SolutionTest: XCTestCase {
+	
+	static let base64Chars: [UInt8] = Array("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".utf8)
+	
+	static let testStrings = [
+		("this is a string!!","dGhpcyBpcyBhIHN0cmluZyEh"),
+		("this is a test!","dGhpcyBpcyBhIHRlc3Qh"),
+		("now is the time for all good men to come to the aid of their country.","bm93IGlzIHRoZSB0aW1lIGZvciBhbGwgZ29vZCBtZW4gdG8gY29tZSB0byB0aGUgYWlkIG9mIHRoZWlyIGNvdW50cnku"),
+		("1234567890  ", "MTIzNDU2Nzg5MCAg"),
+		("ABCDEFGHIJKLMNOPQRSTUVWXYZ ", "QUJDREVGR0hJSktMTU5PUFFSU1RVVldYWVog"),
+		("the quick brown fox jumps over the white fence. ","dGhlIHF1aWNrIGJyb3duIGZveCBqdW1wcyBvdmVyIHRoZSB3aGl0ZSBmZW5jZS4g"),
+		("dGhlIHF1aWNrIGJyb3duIGZveCBqdW1wcyBvdmVyIHRoZSB3aGl0ZSBmZW5jZS4","ZEdobElIRjFhV05ySUdKeWIzZHVJR1p2ZUNCcWRXMXdjeUJ2ZG1WeUlIUm9aU0IzYUdsMFpTQm1aVzVqWlM0"),
+		("VFZSSmVrNUVWVEpPZW1jMVRVTkJaeUFna","VkZaU1NtVnJOVVZXVkVwUFpXMWpNVlJWVGtKYWVVRm5h"),
+		("TVRJek5EVTJOemc1TUNBZyAg","VFZSSmVrNUVWVEpPZW1jMVRVTkJaeUFn"),
+		("e", "ZQ=="),
+		("ee", "ZWU=")
+	]
+	
+	static var allTests = [
+		("Encode Test", encodeTest),
+		("Decode Test", decodeTest)
+	]
+	
+	func encodeTest() {
+		for stringPair in SolutionTest.testStrings {
+			XCTAssertEqual(stringPair.0.toBase64, stringPair.1)
+		}
+	}
+	
+	func decodeTest() {
+		for stringPair in SolutionTest.testStrings {
+			XCTAssertEqual(stringPair.1.fromBase64, stringPair.0)
+		}
+	}
+}
+
+
+XCTMain([
+	testCase(SolutionTest.allTests)
+])
+
+*/