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refactor: slices 25th exercise

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This commit is contained in:
Inanc Gumus
2019-08-18 14:03:08 +03:00
parent df18e1a4bd
commit 552a6a6cf7
3 changed files with 119 additions and 140 deletions
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93
16-slices/exercises/25-add-lines/solution/main.go
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@ -14,58 +14,45 @@ import (
s "github.com/inancgumus/prettyslice"
)
//
// ! NOTE If the program does not work, please update your
// local copy of the prettyslice package:
//
// go get -u github.com/inancgumus/prettyslice
//
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)
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`)
// CREATE A LARGE ENOUGH BUFFER
// `+3` because we're going to add 3 newline characters
// `+3` because we're going to add 3 newline characters to the fix slice.
fix := make([]string, len(lyric)+3)
// CALCULATE THE CUT POINTS
//
// + The first sentence has 8 words so its cutpoint is 8.
// USE A SLICE TO STORE WHERE EACH SENTENCE ENDS
//
// + The second one has 10 words so its cutpoint is 10.
// + The first sentence has 8 words so its cutting index is 8.
//
// + The third one has 5 words so its cutpoint is 5.
// yesterday all my troubles seemed so far away now it looks as though they are here to stay
// |
// v
// cutting index: 8
//
//
// yesterday all my troubles seemed so far away now it looks as though they are here to stay
// |
// v
// cutpoint: 8
// + The second sentence has 10 words so its cutting index is 10.
//
// ... now it looks as though they are here to stay oh i believe in yesterday
// |
// v
// 10
// now it looks as though they are here to stay oh i believe in yesterday
// |
// v
// cutting index: 10
//
//
// + The last sentence has 5 words so its cutting index is 5.
//
// oh i believe in yesterday
// |
// v
// cutting index: 5
//
// ... now it looks as though they are here to stay oh i believe in yesterday
// |
// v
// 5
cutpoints := []int{8, 10, 5}
// `n` tracks how much we've moved inside the `lyric` slice
// `i` tracks the sentence that we're on
//
// `n` tracks how much we've moved inside the `lyric` slice.
//
// `i` tracks the sentence that we're on.
//
for i, n := 0, 0; n < len(lyric); i++ {
//
// copy to `fix` from the `lyric`
@ -81,16 +68,21 @@ func main() {
//
n += copy(fix[n+i:], lyric[n:n+cutpoints[i]])
// add a newline after the number of copied elements
// notice that the '\n' position slides as we move over
// that's why n+i
//
// add a newline after each sentence.
//
// notice that the '\n' position slides as we move over.
// that's why it's: `n+i`.
//
fix[n+i] = "\n"
// uncomment this to aid debugging (to see how the fix slice changes)
// uncomment to see how the fix slice changes.
// s.Show("fix slice", fix)
}
// print the fix slice
s.Show("fix slice", fix)
// print the sentences
for _, w := range fix {
fmt.Print(w)
if w != "\n" {
@ -98,3 +90,18 @@ func main() {
}
}
}
func init() {
//
// YOU DON'T NEED TO TOUCH THIS
//
// This initializes some options for the prettyslice package.
// You can change the options if you want.
//
// This code runs before the main function above.
//
// s.Colors(false) // if your editor is light background color then enable this
s.PrintBacking = true // prints the backing arrays
s.MaxPerLine = 5 // prints max 15 elements per line
s.SpaceCharacter = '⏎' // print this instead of printing a newline (for debugging)
}