add: slices advanced ops

16-slices/15-multi-dimensional-slices/version-1/main.go

@@ -0,0 +1,33 @@
+// 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() {
+	// 1st day: $200, $100
+	// 2nd day: $500
+	// 3rd day: $50, $25, and $75
+
+	spendings := [][]int{
+		{200, 100},   // 1st day
+		{500},        // 2nd day
+		{50, 25, 75}, // 3rd day
+	}
+
+	for i, daily := range spendings {
+		var total int
+		for _, spending := range daily {
+			total += spending
+		}
+
+		fmt.Printf("Day %d: %d\n", i+1, total)
+	}
+}

16-slices/15-multi-dimensional-slices/version-2/main.go

@@ -0,0 +1,30 @@
+// 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() {
+	spendings := make([][]int, 0, 5)
+
+	spendings = append(spendings, []int{200, 100})
+	spendings = append(spendings, []int{25, 10, 45, 60})
+	spendings = append(spendings, []int{5, 15, 35})
+	spendings = append(spendings, []int{95, 10}, []int{50, 25})
+
+	for i, daily := range spendings {
+		var total int
+		for _, spending := range daily {
+			total += spending
+		}
+
+		fmt.Printf("Day %d: %d\n", i+1, total)
+	}
+}

16-slices/15-multi-dimensional-slices/version-3/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"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	spendings := fetch()
+
+	for i, daily := range spendings {
+		var total int
+		for _, spending := range daily {
+			total += spending
+		}
+
+		fmt.Printf("Day %d: %d\n", i+1, total)
+	}
+}
+
+func fetch() [][]int {
+	content := `200 100
+25 10 45 60
+5 15 35
+95 10
+50 25`
+
+	lines := strings.Split(content, "\n")
+
+	spendings := make([][]int, len(lines))
+
+	for i, line := range lines {
+		fields := strings.Fields(line)
+
+		spendings[i] = make([]int, len(fields))
+
+		for j, field := range fields {
+			spending, _ := strconv.Atoi(field)
+			spendings[i][j] = spending
+		}
+	}
+
+	return spendings
+}