add: unfinished code. people are having problems

14-arrays/_experimental/_14-arrays/05-array-operations/01-getting-length/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() {
+	ages := [2]int{15, 20}
+
+	// i can directly use `len`
+	fmt.Println(len(ages)) // 2
+
+	// i can also assign its result to a variable
+	l := len(ages)
+	fmt.Println(l) // 2
+
+	// let's print the length of a few arrays
+	l = len([1]bool{true}) // 1
+	fmt.Println(l)
+
+	l = len([3]string{"lina", "james", "joe"}) // 3
+	fmt.Println(l)
+
+	// this array doesn't initialize any elements
+	// but its length is still 5
+	// whether the elements are initialized or not
+	l = len([5]int{})
+	fmt.Println(l) // 5
+	fmt.Println([5]int{})
+}

14-arrays/_experimental/_14-arrays/05-array-operations/02-getting-elements/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() {
+	ages := [2]int{15, 20}
+
+	// WRONG (try it):
+	// fmt.Println(ages[-1])
+
+	fmt.Println("1st item:", ages[0])
+	fmt.Println("2nd item:", ages[1])
+
+	// fmt.Println("2nd item:", ages[2])
+
+	// fmt.Println(ages[len(ages)])
+	// here, `len(ages) - 1` equals to 1
+	fmt.Println("last item:", ages[len(ages)-1])
+
+	// let's display the indexes and the items
+	// of the array
+	for i, v := range ages {
+		fmt.Printf("index: %d, value: %d\n", i, v)
+	}
+}

14-arrays/_experimental/_14-arrays/05-array-operations/03-getting-elements/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() {
+	ages := [2]int{15, 20}
+
+	ages[0] = 6
+	ages[1] *= 3
+
+	fmt.Println(ages)
+
+	// increase the last element by 1
+	ages[1]++
+	ages[len(ages)-1]++
+
+	fmt.Println(ages)
+
+	// v is a copy
+	for _, v := range ages {
+		// it's like:
+		// v = ages[0]
+		// v++
+
+		// and:
+		// v = ages[1]
+		// v++
+
+		v++
+	}
+
+	fmt.Println(ages)
+
+	// you don't need to use blank-identifier for the value
+	// for i, _ := range ages {
+
+	for i := range ages {
+		ages[i]++
+	}
+
+	fmt.Println(ages)
+}