restructure: arrays and slices

16-slices/07-slice-expressions-pagination/main.go

@@ -0,0 +1,49 @@
+// 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"
+
+	s "github.com/inancgumus/prettyslice"
+)
+
+func main() {
+	// think of this as search results of a search engine.
+	// it could have been fetched from a database
+	items := []string{
+		"pacman", "mario", "tetris", "doom",
+		"galaga", "frogger", "asteroids", "simcity",
+		"metroid", "defender", "rayman", "tempest",
+		"ultima",
+	}
+
+	// s.Show("0:4", items[0:4])
+	// s.Show("4:8", items[4:8])
+	// s.Show("8:12", items[8:12])
+	// s.Show("12:13", items[12:13])
+	// s.Show("12:14", items[12:14]) // error
+
+	l := len(items)
+
+	const pageSize = 4
+
+	for from := 0; from < l; from += pageSize {
+		to := from + pageSize
+		if to > l {
+			to = l
+		}
+
+		// fmt.Printf("%d:%d\n", from, to)
+
+		currentPage := items[from:to]
+
+		head := fmt.Sprintf("Page #%d", (from/pageSize)+1)
+		s.Show(head, currentPage)
+	}
+}