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Rooted by: Convert to Base 2
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  • Code 
    extension Int {
  var toBinary: Int {
    return (self < 0 ? -1 : 1) * (Int(String(abs(self), radix: 2)) ?? 0)
  }
}
     Test Cases 
    import XCTest
// XCTest Spec Example:
// TODO: replace with your own tests (TDD), these are just how-to examples to get you started

class SolutionTest: XCTestCase {
    static var allTests = [
        ("Test Example", testExample),
    ]

    func testExample() {
        XCTAssertEqual(0.toBinary, 0)
        XCTAssertEqual(1.toBinary, 1)
        XCTAssertEqual(5.toBinary, 101)
        XCTAssertEqual(10.toBinary, 1010)
        XCTAssertEqual(15.toBinary, 1111)
        XCTAssertEqual(20.toBinary, 10100)
        XCTAssertEqual(25.toBinary, 11001)
        XCTAssertEqual(50.toBinary, 110010)
        XCTAssertEqual(-50.toBinary, -110010)
        
        XCTAssertEqual(12345.toBinary, 11000000111001)
    }
}

XCTMain([
    testCase(SolutionTest.allTests)
])
    View Run Output
  • Code
    • func binaryConverter(_ input: Int) -> Int {
    • //Your Code Here
    • return input
    • extension Int {
    • var toBinary: Int {
    • return (self < 0 ? -1 : 1) * (Int(String(abs(self), radix: 2)) ?? 0)
    • }
    • }
     Test Cases
    • import XCTest
    • // XCTest Spec Example:
    • // TODO: replace with your own tests (TDD), these are just how-to examples to get you started
    • class SolutionTest: XCTestCase {
    • static var allTests = [
    • ("Test Example", testExample),
    • ]
    • func testExample() {
    • let actual = 1
    • XCTAssertEqual(actual, 1)
    • XCTAssertEqual(0.toBinary, 0)
    • XCTAssertEqual(1.toBinary, 1)
    • XCTAssertEqual(5.toBinary, 101)
    • XCTAssertEqual(10.toBinary, 1010)
    • XCTAssertEqual(15.toBinary, 1111)
    • XCTAssertEqual(20.toBinary, 10100)
    • XCTAssertEqual(25.toBinary, 11001)
    • XCTAssertEqual(50.toBinary, 110010)
    • XCTAssertEqual(-50.toBinary, -110010)
    • XCTAssertEqual(12345.toBinary, 11000000111001)
    • }
    • }
    • XCTMain([
    • testCase(SolutionTest.allTests)
    • ])