Reverse the order of lines in a text file while preserving the contents of each line: Difference between revisions
Reverse the order of lines in a text file while preserving the contents of each line (view source)
Revision as of 19:24, 3 August 2021
, 2 years agoAdded Go
mNo edit summary |
(Added Go) |
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Line 20:
Also, don't include the rightmost informative comments (◄■■■■■■), as they are not meant to be part of the file.
<br><br>
=={{header|Go}}==
{{trans|Wren}}
<lang go>package main
import (
"bytes"
"fmt"
"io/ioutil"
"log"
"runtime"
)
func main() {
fileName1 := "rodgers.txt"
fileName2 := "rodgers_reversed.txt"
lineBreak := "\n"
if runtime.GOOS == "windows" {
lineBreak = "\r\n"
}
// read lines from input file
b, err := ioutil.ReadFile(fileName1)
if err != nil {
log.Fatal(err)
}
lines := bytes.Split(b, []byte(lineBreak))
// remove final blank line, if any, added by some editors
if len(lines[len(lines)-1]) == 0 {
lines = lines[:len(lines)-1]
}
// write lines in reverse order to output file
for i, j := 0, len(lines)-1; i < j; i, j = i+1, j-1 {
lines[i], lines[j] = lines[j], lines[i]
}
b = bytes.Join(lines, []byte(lineBreak))
if err = ioutil.WriteFile(fileName2, b, 0o666); err != nil {
log.Fatal(err)
}
// print contents of output file to terminal
b, err = ioutil.ReadFile(fileName2)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(b))
}</lang>
{{out}}
<pre>
--- Will Rodgers
until you can find a rock."
saying 'Nice Doggy'
"Diplomacy is the art of
</pre>
=={{header|Julia}}==
Line 32 ⟶ 87:
"Diplomacy is the art of
</pre>
=={{header|Nim}}==
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