add: map exercises and quiz

22-maps/exercises/03-students/main.go

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+package main
+
+// ---------------------------------------------------------
+// EXERCISE: Students
+//
+//  Create a program that returns the students by the given
+//  Hogwarts house name (see the data below).
+//
+//  Print the students sorted by name.
+//
+//  "bobo" doesn't belong to Hogwarts, remove it by using
+//  the delete function.
+//
+//
+// RESTRICTIONS
+//
+//  + Add the following data to your map as is.
+//    Do not sort it manually and do not modify it.
+//
+//  + Slices in the map shouldn't be sorted (changed).
+//    HINT: Copy them.
+//
+//
+// EXPECTED OUTPUT
+//
+//  go run main.go
+//
+//  Please type a Hogwarts house name.
+//
+//
+//  go run main.go bobo
+//
+//  Sorry. I don't know anything about "bobo".
+//
+//
+//  go run main.go hufflepuf
+//
+//  ~~~ hufflepuf students ~~~
+//
+//        + diggory
+//        + helga
+//        + scamander
+//        + wenlock
+//
+// ---------------------------------------------------------
+
+func main() {
+	// House        Student Name
+	// ---------------------------
+	// gryffindor   weasley
+	// gryffindor   hagrid
+	// gryffindor   dumbledore
+	// gryffindor   lupin
+	// hufflepuf    wenlock
+	// hufflepuf    scamander
+	// hufflepuf    helga
+	// hufflepuf    diggory
+	// ravenclaw    flitwick
+	// ravenclaw    bagnold
+	// ravenclaw    wildsmith
+	// ravenclaw    montmorency
+	// slytherin    horace
+	// slytherin    nigellus
+	// slytherin    higgs
+	// slytherin    scorpius
+	// bobo         wizardry
+	// bobo         unwanted
+}

22-maps/exercises/03-students/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"
+	"os"
+	"sort"
+)
+
+func main() {
+	houses := map[string][]string{
+		"gryffindor": {"weasley", "hagrid", "dumbledore", "lupin"},
+		"hufflepuf":  {"wenlock", "scamander", "helga", "diggory", "bobo"},
+		"ravenclaw":  {"flitwick", "bagnold", "wildsmith", "montmorency"},
+		"slytherin":  {"horace", "nigellus", "higgs", "bobo", "scorpius"},
+		"bobo":       {"wizardry", "unwanted"},
+	}
+
+	// remove "bobo" house
+	delete(houses, "bobo")
+
+	args := os.Args[1:]
+	if len(args) < 1 {
+		fmt.Println("Please type a Hogwarts house name.")
+		return
+	}
+
+	house, students := args[0], houses[args[0]]
+	if students == nil {
+		fmt.Printf("Sorry. I don't know anything about %q.\n", house)
+		return
+	}
+
+	// only sort the clone
+	clone := append([]string(nil), students...)
+	sort.Strings(clone)
+
+	fmt.Printf("~~~ %s students ~~~\n\n", house)
+	for _, student := range clone {
+		fmt.Printf("\t+ %s\n", student)
+	}
+}