update book code

eBook/examples/chapter_7/array_slices.go

@@ -1,32 +1,33 @@
-package main
-import "fmt"
-
-func main() {
-    var arr1 [6]int
-    var slice1 []int = arr1[2:5] // item at index 5 not included!
-
-    // load the array with integers: 0,1,2,3,4,5
-    for i := 0; i < len(arr1); i++ {
-        arr1[i] = i
-    }
-
-    // print the slice
-    for i := 0; i < len(slice1); i++ {
-        fmt.Printf("Slice at %d is %d\n", i, slice1[i])
-    }
-
-    fmt.Printf("The length of arr1 is %d\n", len(arr1))
-    fmt.Printf("The length of slice1 is %d\n", len(slice1))
-    fmt.Printf("The capacity of slice1 is %d\n", cap(slice1))
-
-// grow the slice
-    slice1 = slice1[0:4]
-    for i := 0; i < len(slice1); i++ {
-        fmt.Printf("Slice at %d is %d\n", i, slice1[i])
-    }
-    fmt.Printf("The length of slice1 is %d\n", len(slice1))
-    fmt.Printf("The capacity of slice1 is %d\n", cap(slice1))
-
-// grow the slice beyond capacity
-    //slice1 = slice1[0:7 ] // panic: runtime error: slice bound out of range
-}
+package main
+
+import "fmt"
+
+func main() {
+	var arr1 [6]int
+	var slice1 []int = arr1[2:5] // index 5 niet meegerekend!
+
+	// load the array with integers: 0,1,2,3,4,5
+	for i := 0; i < len(arr1); i++ {
+		arr1[i] = i
+	}  
+
+	// print the slice:
+	for i := 0; i < len(slice1); i++ {
+		fmt.Printf("Slice at %d is %d\n", i, slice1[i])
+	}
+
+	fmt.Printf("The length of arr1 is %d\n", len(arr1))
+	fmt.Printf("The length of slice1 is %d\n", len(slice1))
+	fmt.Printf("The capacity of slice1 is %d\n", cap(slice1))
+	
+	// grow the slice:
+	slice1 = slice1[0:4] 
+	for i := 0; i < len(slice1); i++ {
+		fmt.Printf("Slice at %d is %d\n", i, slice1[i])
+	}
+	fmt.Printf("The length of slice1 is %d\n", len(slice1))
+	fmt.Printf("The capacity of slice1 is %d\n", cap(slice1))
+	
+	// grow the slice beyond capacity:
+	// slice1 = slice1[0:7 ] // panic: runtime error: slice bounds out of range
+}