Mandelbrot in Swift

Mandelbrot

for line in 0...32 {
    println("".join((0...78).map { (col: Int) -> String in
        var x = 0.0, y = x, i = 0
        do {
            x = x * x - y * y + Double(col) / 20.0 - 2.3
            y = 2 * x * y + Double(line) / 10.0 - 1.5
            i++
        } while (x * x + y * y) < 4 && i < 78
        
        return "\(UnicodeScalar(0x1f35b + i))"
        })
    )
}

https://twitter.com/jonelf/status/580007606481215488

http://swiftstub.com/198900712/

In Swift 2.2.1

for line in 0...32 {
    print((0...78).map { (col: Int) -> String in
        var x = 0.0, y = x, i = 0
        repeat {
            x = x * x - y * y + Double(col) / 20.0 - 2.3
            y = 2 * x * y + Double(line) / 10.0 - 1.5
            i = i + 1
        } while (x * x + y * y) < 4 && i < 78
        return "\(UnicodeScalar(0x1f35b + i))"
    }.joinWithSeparator(""))
}

In Swift 3.0

for line in 0...32 {
    print((0...65).map { (col: Int) -> String in
        var x = 0.0, y = x, i = 0
        repeat {
            x = x * x - y * y + Double(col) / 20.0 - 2.1
            y = 2 * x * y + Double(line) / 10.0 - 1.5
            i = i + 1
        } while (x * x + y * y) < 4 && i < 78
        return "\(UnicodeScalar(0x1f35b + i))"
    }.joined(separator: ""))
}

https://swiftlang.ng.bluemix.net/#/repl/5759332a83847baf29642974

for line in 0...42 {
    print((0...65).map { (col: Int) -> String in
        var x = 0.0, y = x, i = 0
        repeat {
            x = x * x - y * y + Double(col) / 20.0 - 2.1
            y = 2 * x * y + Double(line) / 13.0 - 1.5
            i = i + 1
        } while (x * x + y * y) < 4 && i < 78
        return String(UnicodeScalar(i + 0x1f35b)!)
    }.joined(separator: ""))
}

This one works in Swift 5.9.2. Save and run with xcrun swift filename.swift

Open a big macOS terminal and run
echo 'for l in 0...42{print((0...65).map{(col: Int)->String in var x=0.0,y=x,i=0;repeat{x=x*x-y*y+Double(col)/20.0-2.1;y=2*x*y+Double(l)/13.0-1.5;i=i+1}while(x*x+y*y)<4&&i<78;return String(UnicodeScalar(i+0x1f35b)!)}.joined(separator:""))}'|swift

The above is not working in swift-driver version: 1.120.5 Apple Swift version 6.1.2 (swiftlang-6.1.2.1.2 clang-1700.0.13.5).
You have to add repl like this
echo 'for l in 0...42{print((0...65).map{(col: Int)->String in var x=0.0,y=x,i=0;repeat{x=x*x-y*y+Double(col)/20.0-2.1;y=2*x*y+Double(l)/13.0-1.5;i=i+1}while(x*x+y*y)<4&&i<78;return String(UnicodeScalar(i+0x1f35b)!)}.joined(separator:""))}'|swift repl