add: array exercises

14-arrays/exercises/07-assign/main.go

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+package main
+
+// ---------------------------------------------------------
+// EXERCISE: Assign the Arrays
+//
+//  1. Create an array named books
+//  2. Add book titles to the array
+//  3. Create two more copies of the array named: upper and lower
+//  4. Change the book titles to uppercase in the upper array only
+//  5. Change the book titles to lowercase in the lower array only
+//  6. Print all the arrays
+//  7. Observe that the arrays are not connected when they're copied.
+//
+// NOTE
+//  Check out the strings package, it has functions to convert letters to
+//  upper and lower cases.
+//
+// BONUS
+//  Invent your own arrays with different types other than string,
+//  and do some manipulations on them.
+//
+// EXPECTED OUTPUT
+//   Note: Don't worry about the book titles here, you can use any title.
+//
+//   books: ["Kafka's Revenge" "Stay Golden" "Everythingship"]
+//   upper: ["KAFKA'S REVENGE" "STAY GOLDEN" "EVERYTHINGSHIP"]
+//   lower: ["kafka's revenge" "stay golden" "everythingship"]
+// ---------------------------------------------------------
+
+func main() {
+}

14-arrays/exercises/07-assign/solution/main.go

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+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+func main() {
+	books := [...]string{"Kafka's Revenge", "Stay Golden", "Everythingship"}
+
+	upper, lower := books, books
+
+	for i := range books {
+		upper[i] = strings.ToUpper(upper[i])
+		lower[i] = strings.ToLower(lower[i])
+	}
+
+	fmt.Printf("books: %q\n", books)
+	fmt.Printf("upper: %q\n", upper)
+	fmt.Printf("lower: %q\n", lower)
+}