add: for statement loop exercises

13-loops/05-for-range/02-loop-over-words/main.go

@@ -0,0 +1,51 @@
+// 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"
+	"strings"
+)
+
+func main() {
+	// this will split the following string by spaces
+	// and then it will put it inside words variable
+	// as a slice of strings
+	words := strings.Fields(
+		"lazy cat jumps again and again and again",
+	)
+	//    1    2    3    4    5     6    7    8
+
+	// --------------------------------
+	// #1st way:
+	// --------------------------------
+	// for j := 0; j < len(words); j++ {
+	// 	fmt.Printf("#%-2d: %q\n", j+1, words[j])
+	// }
+
+	// --------------------------------
+	// #2nd way (best):
+	// --------------------------------
+	for i, v := range words {
+		fmt.Printf("#%-2d: %q\n", i+1, v)
+	}
+
+	// --------------------------------
+	// #3rd way (reuse mechanism):
+	// --------------------------------
+	// var (
+	// 	i int
+	// 	v string
+	// )
+
+	// for i, v = range words {
+	// 	fmt.Printf("#%-2d: %q\n", i+1, v)
+	// }
+
+	// fmt.Printf("Last value of i and v %d %q\n", i, v)
+}