add 08.2.md 08.3.md 08.4.md 08.5.md 08.6.md

eBook/examples/chapter_8/slice_maps.go

@@ -0,0 +1,20 @@
+package main
+import "fmt"
+
+func main() {
+    // Version A:
+    items := make([]map[int]int, 5)
+    for i:= range items {
+        items[i] = make(map[int]int, 1)
+        items[i][1] = 2
+    }
+    fmt.Printf("Version A: Value of items: %v\n", items)
+
+    // Version B: NOT GOOD!
+    items2 := make([]map[int]int, 5)
+    for _, item := range items2 {
+        item = make(map[int]int, 1) // item is only a copy of the slice element.
+        item[1] = 2 // This 'item' will be lost on the next iteration.
+    }
+    fmt.Printf("Version B: Value of items: %v\n", items2)
+}