refactor: slices 26th exercise

16-slices/exercises/26-print-daily-requests/solution/main.go

@@ -13,24 +13,22 @@ import (
 )
 
 func main() {
-	//
-	// DAILY REQUESTS DATA
-	//
-	reqs := []int{
-		500, 600, 250,
-		200, 400, 50,
-		900, 800, 600,
-		750, 250, 100,
-		100, 150,
-	}
-
-	//
-	// There are 3 requests per day
-	//
+	// There are 3 request totals per day
 	const N = 3
 
+	// DAILY REQUESTS DATA (PER 8-HOUR)
+	reqs := []int{
+		500, 600, 250, // 1st day
+		200, 400, 50, // 2nd day
+		900, 800, 600, // 3rd day
+		750, 250, 100, // 4th day
+	}
+
+	// ================================================
+	// Allocate a slice efficiently with the exact size needed.
 	//
-	// Allocate the slice efficiently with the exact size needed
+	// Find the `size` automatically using the `reqs` slice.
+	// Do not type it manually.
 	//
 	l := len(reqs)
 	size := l / N
@@ -38,44 +36,49 @@ func main() {
 		size++
 	}
 	daily := make([][]int, 0, size)
+	//
+	// ================================================
 
+	// ================================================
+	// Group the `reqs` per day into the slice: `daily`.
 	//
-	// Group the `reqs` per day into a slice named: `daily`
+	// So the daily will be:
+	// [
+	//  [500, 600, 250]
+	//  [200, 400, 50]
+	//  [900, 800, 600]
+	//  [750, 250, 100]
+	// ]
 	//
-	for N < len(reqs) {
-		daily = append(daily, reqs[:N]) // add the current batch of nums to the `groups`
-		reqs = reqs[N:]                 // move the slice pointer for the next batch
+	for N <= len(reqs) {
+		daily = append(daily, reqs[:N]) // append the daily requests
+		reqs = reqs[N:]                 // move the slice pointer for the next day
 	}
+	// ================================================
 
-	//
-	// Add the residual elements to the group (len(reqs) % N)
-	//
-	daily = append(daily, reqs)
+	// ================================================
+	// Don't touch the following code:
 
-	//
-	// Print the header:
-	//
+	// Print the header
 	fmt.Printf("%-10s%-10s\n", "Day", "Requests")
 	fmt.Println(strings.Repeat("=", 20))
 
-	//
-	// Print the data per day along with the totals:
-	//
+	// Print the data per day along with the totals
 	var grand int
 
-	for i, d := range daily {
+	for i, day := range daily {
 		var sum int
 
-		for _, q := range d {
-			sum += q
-			fmt.Printf("%-10d%-10d\n", i+1, q)
+		for _, req := range day {
+			sum += req
+			fmt.Printf("%-10d%-10d\n", i+1, req)
 		}
 
-		fmt.Println(strings.Repeat("-", 20))
-		fmt.Printf("%10s%-10d\n\n", "", sum)
+		fmt.Printf("%9s %-10d\n\n", "TOTAL:", sum)
 
 		grand += sum
 	}
 
-	fmt.Printf("%10s%-10d\n", "", grand)
+	fmt.Printf("%9s %-10d\n", "GRAND:", grand)
+	// ================================================
 }