remove: map as sets

22-maps/01-english-dict/01-as-a-slice/main.go

@@ -0,0 +1,35 @@
+// 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"
+)
+
+func main() {
+	args := os.Args[1:]
+	if len(args) != 1 {
+		fmt.Println("[english word] -> [turkish word]")
+		return
+	}
+	query := args[0]
+
+	english := []string{"good", "great", "perfect"}
+	turkish := []string{"iyi", "harika", "mükemmel"}
+
+	// O(n) -> Inefficient: Depends on 'n'.
+	for i, w := range english {
+		if query == w {
+			fmt.Printf("%q means %q\n", w, turkish[i])
+			return
+		}
+	}
+
+	fmt.Printf("%q not found\n", query)
+}

22-maps/01-english-dict/02-as-a-map/main.go

@@ -0,0 +1,52 @@
+// 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() {
+	// args := os.Args[1:]
+	// if len(args) != 1 {
+	// 	fmt.Println("[english word] -> [turkish word]")
+	// 	return
+	// }
+	// query := args[0]
+
+	// #1: Nil Map: Read-Only
+	var dict map[string]string
+
+	// #5: You cannot assign to a nil map.
+	// dict["up"] = "yukarı"
+	// dict["down"] = "aşağı"
+
+	// #2: Map retrieval is O(1) — on average.
+	key := "good"
+
+	value := dict[key]
+	fmt.Printf("%q means %#v\n", key, value)
+
+	// #1B
+	fmt.Printf("# of Keys: %d\n", len(dict))
+
+	// fmt.Printf("Zero Value: %#v\n", dict)
+
+	// #4: Nil map ready to use
+	// if dict != nil {
+	// 	value := dict[key]
+	// 	fmt.Printf("%q means %#v\n", key, value)
+	// }
+
+	// #3: Cannot use non-comparable types as map key types
+	// var broken map[[]int]int
+	// var broken map[map[int]string]bool
+	//
+	// A map can only be compared to nil value
+	// _ = dict == nil
+}