A good start to learn Swift 3

I found Mac is much better to be used than windows system. The mouse is super good without wheel as the top part of mouse is actually touchable. To do copy/paste you need to use cmd key + C/V.

Following note are from what I learned for swift 3:

Swift simplified memory management using ARC - Automatic Reference Counting.

Using let for constant, var is used for variable:

let oneMillion = 1_000_000

You can use min and max properties for integer type to get maximum and minimum value.

// 定义类型别名 typealias
typealias AudioSample = UInt16 

// optional binding，只有当yyy是optional的时候才可以这样用。optional的yyy非空时为真，将yyy中的值取出赋给xxx，空时（nil）为假；

if let xxx = yyy {
     // do something
} else {
     // do other thing
}

// decompose一个tuple时，对于不想使用的元素用’_’接收
let http404Error = (404, "Not Found")
let (justTheStatusCode, _) = http404Error
println("The status code is \(justTheStatusCode)")
// prints "The status code is 404

let possibleNumber = "123"
let convertedNumber = possibleNumber.toInt()
// convertedNumber is inferred to be of type "Int?", or "optional Int”，因为toInt()可能会失败（比如“123a”）导致返回nil

!== and === are identity operators and are used to determine if two objects have the same reference.

var arr1 = [1, 2, 3]
var arr2 = arr1
arr2[0] = 10;
arr1     // [10, 2, 3]
arr2     // [10, 2, 3]
arr1 === arr2  // true

把《The Swift Programming Language》读薄

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