How Can I Read and Write Text Files as String Arrays in Go?
Dec 14, 2024 am 03:41 AM
Reading and Writing Text Files as String Arrays in Go
The ability to handle text files is a common requirement in programming, including reading and writing to string arrays. In Go, a solution exists to address this need.
Reading Text Files
As of Go 1.1, the bufio.Scanner API provides an efficient way to read lines from a file into a string slice. Here's an example:
import (
"bufio"
"fmt"
"os"
)
func readLines(path string) ([]string, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer file.Close()
var lines []string
scanner := bufio.NewScanner(file)
for scanner.Scan() {
lines = append(lines, scanner.Text())
}
return lines, scanner.Err()
}
This function reads a whole file into memory and returns a slice of its lines.
Writing Text Files
To write a string slice to a text file, you can use the bufio.Writer type:
import (
"bufio"
"fmt"
"os"
)
func writeLines(lines []string, path string) error {
file, err := os.Create(path)
if err != nil {
return err
}
defer file.Close()
w := bufio.NewWriter(file)
for _, line := range lines {
fmt.Fprintln(w, line)
}
return w.Flush()
}
This function creates a file, writes the lines to it, and flushes the buffer to ensure the data is written to disk.
Example Usage
Here's an example of how to use these functions:
lines, err := readLines("foo.in.txt")
if err != nil {
log.Fatalf("readLines: %s", err)
}
// Process the lines...
if err := writeLines(lines, "foo.out.txt"); err != nil {
log.Fatalf("writeLines: %s", err)
}
This code reads lines from the "foo.in.txt" file, processes them, and writes them to the "foo.out.txt" file.
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