Francescu

func |<T>(a:T?, b:T) -> T {
    if a != nil {
        return a!
    }
    return b
}

// You can test it in playground

var optional:String?

Francescu

class A {
    let b = "TEST"
    var c = self.b //no error
}

class D {
    let e = "TEST"
    let f = self.e //error
}

Francescu

extension Array {
    func mapSome<R>(transform: T -> R?) -> [R] {
        return self.reduce([R]()) {
            if let unwrappedValue = transform($1) {
                return $0 + [unwrappedValue]
            }
            return $0
        }
    }
}

Francescu

queryString = (params) ->
    _.map params, (value, key) ->
	    encodeURIComponent(key) + "=" + encodeURIComponent(value)
    .join("&").replace(/%20/g, "+")

Francescu

scratchCanvas = document.createElement('canvas')
scratchCanvas.width = size
scratchCanvas.height = size
scratchCtx = scratchCanvas.getContext('2d')

scratchCtx.clearRect(0, 0, scratchCanvas.width, scratchCanvas.height)

scratchCtx.globalCompositeOperation = 'source-over'

scratchCtx.drawImage(image, 0, 0, size, size)

Francescu

protocol Hook {
    var matchingPaths: [Int : String] { get }
    var matchingVars: [Int : String] { get }
    
    func match(pathComponents: [String]) -> String?
}


extension Hook {
    func match(pathComponents: [String], queryString: String) -> String? {

Francescu

String(contentsOfFile: "/test.txt")
/* OUTPUTS:
main.swift:2:17: note: overloads for 'String' exist with these partially matching parameter lists: (_StringCore), (Character), (String.CharacterView), (_builtinUnicodeScalarLiteral: Int32), (unicodeScalarLiteral: String), (extendedGraphemeClusterLiteral: String), (stringLiteral: String), (_storage: _StringBuffer), (S), (stringInterpolation: String...), (stringInterpolationSegment: T), (stringInterpolationSegment: String), (stringInterpolationSegment: Character), (stringInterpolationSegment: UnicodeScalar), (stringInterpolationSegment: Bool), (stringInterpolationSegment: Float32), (stringInterpolationSegment: Float64), (stringInterpolationSegment: UInt8), (stringInterpolationSegment: Int8), (stringInterpolationSegment: UInt16), (stringInterpolationSegment: Int16), (stringInterpolationSegment: UInt32), (stringInterpolationSegment: Int32), (stringInterpolationSegment: UInt64), (stringInterpolationSegment: Int64), (stringInterpolationSegment: UInt), (stringInterpola

Francescu

1> import Foundation
2> let test = String(contentsOfFile: "/test.txt")
fatal error: init(contentsOfFile:usedEncoding:) is not yet implemented: file Foundation/NSString.swift, line 1304
test: String = {
  _core = {
    _baseAddress = <extracting data from value failed>

    _countAndFlags = <extracting data from value failed>

    _owner = <extracting data from value failed>

Francescu

import UIKit

class Foo {
    var bar: Int
    
    init(bar: Int) {
        self.bar = bar
    }
}

Francescu

import Foundation

infix operator ..

func ..<T:AnyObject>(lhs: T, rhs:(T) -> Void) -> T {
    rhs(lhs)
    return lhs
}