halftrue

class UserBuilder {
    var name: String
    var gender: String

    init() {
        self.name = "default name"
        self.gender = "default gender"
    }
}

halftrue

sudo pmset -a GPUSwitch 0
0 ，强制使用核显，

1 ， 强制使用独显，

2 ，自动切换图形卡

halftrue

#include <stdio.h>

/* 
* 基姆拉尔森计算公式
* W= (d+2*m+3*(m+1)/5+y+y/4-y/100+y/400) mod 7
*/
int week(int y, int m, int d)
{
	if (m < 3) {
		m += 12;

halftrue

    private func escapedParameters(parameters: [String:AnyObject]) -> String {
        
        if parameters.isEmpty {
            return ""
        } else {
            var keyValuePairs = [String]()
            
            for (key, value) in parameters {
                
                // make sure that it is a string value

halftrue

extension Dictionary where Value: Equatable {
    /// Returns all keys mapped to the specified value.
    /// ```
    /// let dict = ["A": 1, "B": 2, "C": 3]
    /// let keys = dict.keysForValue(2)
    /// assert(keys == ["B"])
    /// assert(dict["B"] == 2)
    /// ```
    func keysForValue(value: Value) -> [Key] {
        return flatMap { (key: Key, val: Value) -> Key? in

halftrue

// approach one 
extension String {
    var length: Int {
        return characters.count
    }
}
// approach two
extension String {
    var length: Int {
        return (self as NSString).length