add: slice adv. ops. exercises

16-slices/exercises/25-add-lines/main.go

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+package main
+
+import (
+	s "github.com/inancgumus/prettyslice"
+)
+
+// ---------------------------------------------------------
+// EXERCISE: Add newlines to the lyric sentences
+//
+//  You have a slice of lyrics data of Beatles' awesome
+//  song: Yesterday. Your goal is adding newlines after
+//  each sentence of the lyric.
+//
+//  Your goal is creating a new slice, then copying
+//  each sentence of the lyric to the new buffer, then
+//  after each sentence adding a newline character.
+//
+//  You cannot guess how many times you will get across
+//  something like this. Believe me, learning this will
+//  make you a better Gopher.
+//
+//
+// RESTRICTIONS
+//
+//  . For warming-up, in this exercise, never use the `append()` func.
+//
+//  	. Instead, only use the `copy()` func.
+//
+//  . You cannot use slicing for printing the sentences.
+//
+//    . Instead, use slicing to fill the new buffer, then print it.
+//
+//
+// STEPS
+//
+//  . Follow the instructions inside the code.
+//
+//
+// EXPECTED OUTPUT
+//
+//  yesterday all my troubles seemed so far away
+//  now it looks as though they are here to stay
+//  oh i believe in yesterday
+//
+// ---------------------------------------------------------
+
+func main() {
+	//
+	// YOU DON'T NEED TO TOUCH THIS
+	//
+	// This inits some options for the prettyslice package.
+	// You can change the options if you want.
+	//
+	// s.Colors(false)     // if your editor is light colored then enable this
+	s.PrintBacking = true  // prints the backing arrays
+	s.MaxPerLine = 15      // prints max 15 elements per line
+	s.SpaceCharacter = "*" // print this instead of printing a newline (for debugging)
+
+	//
+	// UNCOMMENT THE VARIABLE BELOW THEN START!
+	//
+
+	// lyric := strings.Fields(`yesterday all my troubles seemed so far away now it looks as though they are here to stay oh i believe in yesterday`)
+
+	//
+	// RESTRICTION EXPLANATION:
+	//
+	// Don't do something like this:
+	// (Do not use slicing for printing the sentences)
+	//
+
+	// fmt.Println(lyric[:8])
+	// fmt.Println(lyric[8:18])
+	// fmt.Println(lyric[18:23])
+
+	// ========================================================================
+	//
+	// #1: CREATE A LARGE ENOUGH BUFFER (A NEW SLICE)
+	//
+	//     You need to put each lyric sentence + a newline into this buffer
+	//
+
+	// I name the buffer: `fix`, you can name it however you want
+	// fix := make(...)
+
+	// ========================================================================
+	//
+	// #2: CALCULATE THE CUT POINTS
+	//
+	//     You want to put newlines after each sentence. So you may want to put
+	//     these index positions into a slice. Then you can use them to cut the
+	//     lyric slice.
+	//
+
+	// cutpoints := []int{...}
+
+	// ========================================================================
+	//
+	// #3: CREATE A LOOP AND COPY THE SENTENCES INTO THE BUFFER
+	//
+
+	// for ... {
+	//   Use the `copy` function to copy from the `lyric` slice to the buffer.
+	//
+	//   Copy a newline character (in a string) to the buffer after each sentence.
+	//
+	//   You can use slicing here for filling the new buffer.
+	//
+	//   Uncomment this to aid debugging (to see how the fix slice changes)
+	//   s.Show("fix slice", fix)
+	// }
+
+	// ========================================================================
+	//
+	// #4: PRINT THE BUFFER
+	//
+
+	// ...
+}