update 11.14 (#504)

eBook/11.14.md

@@ -1,4 +1,4 @@
-# 结构体、集合和高阶函数
+# 11.14 结构体、集合和高阶函数
 
 通常你在应用中定义了一个结构体，那么你也可能需要这个结构体的（指针）对象集合，比如：
 
@@ -48,13 +48,13 @@ func (cs Cars) FindAll(f func(car *Car) bool) Cars {
 ```go
 // Process cars and create new data.
 func (cs Cars) Map(f func(car *Car) Any) []Any {
-		result := make([]Any, 0)
+	result := make([]Any, 0)
-		ix := 0
+	ix := 0
-		cs.Process(func(c *Car) {
+	cs.Process(func(c *Car) {
-				result[ix] = f(c)
+		result[ix] = f(c)
-				ix++
+		ix++
-		})
+	})
-       	return result
+	return result
 }
 ```
 
@@ -62,7 +62,7 @@ func (cs Cars) Map(f func(car *Car) Any) []Any {
 
 ```go
 allNewBMWs := allCars.FindAll(func(car *Car) bool {
-       return (car.Manufacturer == "BMW") && (car.BuildYear > 2010)
+	return (car.Manufacturer == "BMW") && (car.BuildYear > 2010)
 })
 ```
 
@@ -84,7 +84,7 @@ func MakeSortedAppender(manufacturers[]string)(func(car*Car),map[string]Cars) {
 			sortedCars["Default"] = append(sortedCars["Default"], c)
 		}
 
- 	}
+	}
 	return appender, sortedCars
 }
 ```
@@ -112,23 +112,23 @@ import (
 
 type Any interface{}
 type Car struct {
-	Model   	string
+	Model        string
-	Manufacturer	string
+	Manufacturer string
-	BuildYear	int
+	BuildYear    int
-    // ...
+	// ...
 }
 type Cars []*Car
 
 func main() {
 	// make some cars:
-	ford := &Car{"Fiesta","Ford", 2008}
+	ford := &Car{"Fiesta", "Ford", 2008}
-	bmw  := &Car{"XL 450", "BMW", 2011}
+	bmw := &Car{"XL 450", "BMW", 2011}
 	merc := &Car{"D600", "Mercedes", 2009}
 	bmw2 := &Car{"X 800", "BMW", 2008}
 	// query:
 	allCars := Cars([]*Car{ford, bmw, merc, bmw2})
 	allNewBMWs := allCars.FindAll(func(car *Car) bool {
-      return (car.Manufacturer == "BMW") && (car.BuildYear > 2010)
+		return (car.Manufacturer == "BMW") && (car.BuildYear > 2010)
 	})
 	fmt.Println("AllCars: ", allCars)
 	fmt.Println("New BMWs: ", allNewBMWs)
@@ -137,58 +137,58 @@ func main() {
 	sortedAppender, sortedCars := MakeSortedAppender(manufacturers)
 	allCars.Process(sortedAppender)
 	fmt.Println("Map sortedCars: ", sortedCars)
-    BMWCount := len(sortedCars["BMW"])
+	BMWCount := len(sortedCars["BMW"])
 	fmt.Println("We have ", BMWCount, " BMWs")
 }
 
 // Process all cars with the given function f:
 func (cs Cars) Process(f func(car *Car)) {
-     for _, c := range cs {
+	for _, c := range cs {
-         f(c)
+		f(c)
-     }
+	}
 }
 
 // Find all cars matching a given criteria.
 func (cs Cars) FindAll(f func(car *Car) bool) Cars {
-    cars := make([]*Car, 0)
+	cars := make([]*Car, 0)
 
-    cs.Process(func(c *Car) {
+	cs.Process(func(c *Car) {
-        if f(c) {
+		if f(c) {
-            cars = append(cars, c)
+			cars = append(cars, c)
-        }
+		}
-    })
+	})
-    return cars
+	return cars
 }
 
 // Process cars and create new data.
 func (cs Cars) Map(f func(car *Car) Any) []Any {
-       result := make([]Any, len(cs))
+	result := make([]Any, len(cs))
-       ix := 0
+	ix := 0
-       cs.Process(func(c *Car) {
+	cs.Process(func(c *Car) {
-           result[ix] = f(c)
+		result[ix] = f(c)
-           ix++
+		ix++
-       })
+	})
-       return result
+	return result
 }
 
 func MakeSortedAppender(manufacturers []string) (func(car *Car), map[string]Cars) {
-     // Prepare maps of sorted cars.
+	// Prepare maps of sorted cars.
-       sortedCars := make(map[string]Cars)
+	sortedCars := make(map[string]Cars)
 
-       for _, m := range manufacturers {
+	for _, m := range manufacturers {
-           sortedCars[m] = make([]*Car, 0)
+		sortedCars[m] = make([]*Car, 0)
-       }
+	}
-       sortedCars["Default"] = make([]*Car, 0)
+	sortedCars["Default"] = make([]*Car, 0)
 
-       // Prepare appender function:
+	// Prepare appender function:
-       appender := func(c *Car) {
+	appender := func(c *Car) {
-           if _, ok := sortedCars[c.Manufacturer]; ok {
+		if _, ok := sortedCars[c.Manufacturer]; ok {
-               sortedCars[c.Manufacturer] = append(sortedCars[c.Manufacturer], c)
+			sortedCars[c.Manufacturer] = append(sortedCars[c.Manufacturer], c)
-           } else {
+		} else {
-               sortedCars["Default"] = append(sortedCars["Default"], c)
+			sortedCars["Default"] = append(sortedCars["Default"], c)
-           }
+		}
-       }
+	}
-       return appender, sortedCars
+	return appender, sortedCars
 }
 ```