main.go 源码
// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
package main
import (
"fmt"
"strings"
)
func main() {
// --- Correct Lyric ---
// yesterday all my troubles seemed so far away
// now it looks as though they are here to stay
// oh I believe in yesterday
lyric := strings.Fields(`all my troubles seemed so far away oh I believe in yesterday now it looks as though they are here to stay`)
// ------------------------------------------------------------------------
// #1: Prepend "yesterday" to `lyric`
// ------------------------------------------------------------------------
//
// --- BEFORE ---
// all my troubles seemed so far away oh I believe in yesterday
//
// --- AFTER ---
// yesterday all my troubles seemed so far away oh I believe in yesterday
//
// (warning: allocates a new backing array)
//
lyric = append([]string{"yesterday"}, lyric...)
// ------------------------------------------------------------------------
// #2: Put the words to the correct positions in the `lyric` slice.
// ------------------------------------------------------------------------
//
// yesterday all my troubles seemed so far away oh I believe in yesterday
// | |
// v v
// index: 8 pos: 13
//
const N, M = 8, 13
// --- BEFORE ---
//
// yesterday all my troubles seemed so far away oh I believe in yesterday now it looks as though they are here to stay
//
// --- AFTER ---
// yesterday all my troubles seemed so far away oh I believe in yesterday now it looks as though they are here to stay oh I believe in yesterday
// ^
//
// |
// +--- duplicate
//
// (warning: allocates a new backing array)
lyric = append(lyric, lyric[N:M]...)
//
// --- BEFORE ---
// yesterday all my troubles seemed so far away oh I believe in yesterday now it looks as though they are here to stay oh I believe in yesterday
//
// --- AFTER ---
// yesterday all my troubles seemed so far away now it looks as though they are here to stay oh I believe in yesterday
//
// (does not allocate a new backing array because cap(lyric[:N]) > M)
//
lyric = append(lyric[:N], lyric[M:]...)
// ------------------------------------------------------------------------
// #3: Print
// ------------------------------------------------------------------------
fmt.Printf("%s\n", lyric)
}
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