add: slices advanced ops

16-slices/13-make/1-theory/main.go

@@ -0,0 +1,25 @@
+// 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 (
+	prettyslice "github.com/inancgumus/prettyslice"
+)
+
+func main() {
+	prettyslice.PrintBacking = true
+
+	prettyslice.Show("make([]int, 3)", make([]int, 3))
+	prettyslice.Show("make([]int, 3, 5)", make([]int, 3, 5))
+
+	s := make([]int, 0, 5)
+	prettyslice.Show("make([]int, 0, 5)", s)
+
+	s = append(s, 42)
+	prettyslice.Show("s = append(s, 42)", s)
+}

16-slices/13-make/2-example/main.go

@@ -0,0 +1,83 @@
+// 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 (
+	"strings"
+
+	s "github.com/inancgumus/prettyslice"
+)
+
+func main() {
+	s.PrintBacking = true
+	s.MaxPerLine = 10
+
+	// #1: assume that tasks can be a long list
+	// ---------------------------------------------
+	tasks := []string{"jump", "run", "read"}
+
+	// #2: INEFFICIENT WAY
+	// ---------------------------------------------
+	// var upTasks []string
+	// s.Show("upTasks", upTasks)
+
+	// for _, task := range tasks {
+	// 	upTasks = append(upTasks, strings.ToUpper(task))
+	// 	s.Show("upTasks", upTasks)
+	// }
+
+	// #3: SO SO WAY:
+	// ---------------------------------------------
+	// upTasks := make([]string, len(tasks))
+	// s.Show("upTasks", upTasks)
+
+	// for _, task := range tasks {
+	// 	upTasks = append(upTasks, strings.ToUpper(task))
+	// 	s.Show("upTasks", upTasks)
+	// }
+
+	// #4: SO SO WAY 2:
+	// ---------------------------------------------
+	// upTasks := make([]string, len(tasks))
+	// s.Show("upTasks", upTasks)
+
+	// for i, task := range tasks {
+	// 	upTasks[i] = strings.ToUpper(task)
+	// 	s.Show("upTasks", upTasks)
+	// }
+
+	// #5: allocates a new array
+	// upTasks = append(upTasks, "PLAY")
+	// s.Show("upTasks", upTasks)
+
+	// #6: SO SO WAY 3
+	// ---------------------------------------------
+	// upTasks := make([]string, 0, len(tasks))
+
+	// #7
+	// upTasks = upTasks[:cap(upTasks)]
+
+	// #6
+	// s.Show("upTasks", upTasks)
+
+	// for i, task := range tasks {
+	// 	upTasks[i] = strings.ToUpper(task)
+	// 	s.Show("upTasks", upTasks)
+	// }
+
+	// #8: THE BEST WAY
+	// ---------------------------------------------
+	upTasks := make([]string, 0, len(tasks))
+
+	s.Show("upTasks", upTasks)
+
+	for _, task := range tasks {
+		upTasks = append(upTasks, strings.ToUpper(task))
+		s.Show("upTasks", upTasks)
+	}
+}