add: slice adv. ops. exercises

16-slices/exercises/24-fix-the-memory-leak/main.go

@@ -0,0 +1,67 @@
+// 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"
+	"io/ioutil"
+
+	"github.com/inancgumus/learngo/16-slices/exercises/24-fix-the-memory-leak/api"
+)
+
+// ---------------------------------------------------------
+// EXERCISE: Fix the memory leak
+//
+//  You're receiving millions of temperature data points from
+//  an API, but you only need the last 10 data points.
+//
+//  Currently, there is a memory leak in your program.
+//  Find the leak and fix it.
+//
+//
+// EXPECTED OUTPUT
+//
+//   > Memory Usage: 116 KB
+//   > Memory Usage: 118 KB
+//
+//
+// EXPECTED OUTPUT EXPLANATION
+//
+//   Your output will be different. Your goal is to reduce the
+//   difference between the two measurements of the memory usage.
+//
+//   For the expected output above:
+//
+//     118 KB - 116 KB = Only 2 KB so that's OK.
+//
+//   However, in the current program, because of the memory leak,
+//   the difference is huge: about ~60 MB. Run the program and,
+//   see yourself.
+//
+// ---------------------------------------------------------
+
+func main() {
+	// reports the initial memory usage
+	api.Report()
+
+	// reads 65 MB of temperature data into the memory!
+	temps := api.Read()
+
+	// -----------------------------------------------------
+	// ✪ ONLY ADD YOUR CODE INSIDE THIS BOX ✪
+	//
+
+	//
+	// ✪ ONLY ADD YOUR CODE INSIDE THIS BOX ✪
+	// -----------------------------------------------------
+
+	// fix the problem so that the memory usage stays low
+	// dont touch this code
+	api.Report()
+	fmt.Fprintln(ioutil.Discard, temps[0])
+}