add: map exercises and quiz

22-maps/exercises/01-warm-up/main.go

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+package main
+
+// ---------------------------------------------------------
+// EXERCISE: Warm-up
+//
+//  Create and print the following maps.
+//
+//  1. Phone numbers by last name
+//  2. Product availability by Product ID
+//  3. Multiple phone numbers by last name
+//  4. Shopping basket by Customer ID
+//
+//     Each item in the shopping basket has a Product ID and
+//     quantity. Through the map, you can tell:
+//     "Mr. X has bought Y bananas"
+//
+// ---------------------------------------------------------
+
+func main() {
+	// Hint: Store phone numbers as text
+
+	// #1
+	// Key        : Last name
+	// Element    : Last name
+
+	// #2
+	// Key        : Product ID
+	// Element    : Available / Unavailable
+
+	// #3
+	// Key        : Last name
+	// Element    : Phone numbers
+
+	// #4
+	// Key        : Customer ID
+	// Element Key:
+	//   Key: Product ID Element: Quantity
+}

22-maps/exercises/01-warm-up/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import "fmt"
+
+func main() {
+	var (
+		phones map[string]string
+		// Key        : Last name
+		// Element    : Last name
+
+		// Key        : Product ID
+		// Element    : Available / Unavailable
+		products map[int]bool
+
+		multiPhones map[string][]string
+		// Key        : Last name
+		// Element    : Phone numbers
+
+		basket map[int]map[int]int
+		// Key        : Customer ID
+		// Element Key:
+		//   Key: Product ID Element: Quantity
+	)
+
+	fmt.Printf("phones     : %#v\n", phones)
+	fmt.Printf("products   : %#v\n", products)
+	fmt.Printf("multiPhones: %#v\n", multiPhones)
+	fmt.Printf("basket     : %#v\n", basket)
+}