How to Read and Write Text Files to a String Array in Go?

Reading and Writing Text Files to a String Array in Go

Reading and writing text files into and out of a string array is a common requirement in programming. In Go, this can be achieved using the bufio.Scanner API introduced in Go1.1.

Consider the following code snippet that uses bufio.Scanner to read a text file into a string array:

package main

import (
    "bufio"
    "fmt"
    "log"
    "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()
}

func main() {
    lines, err := readLines("foo.in.txt")
    if err != nil {
        log.Fatalf("readLines: %s", err)
    }
    for i, line := range lines {
        fmt.Println(i, line)
    }
}

This function opens the specified file, creates a bufio.Scanner for the file, iterates over each line in the file, and appends the line to a string array.

You can also write a string array to a text file using the writeLines function:

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()
}

func main() {
    lines := []string{"line 1", "line 2", "line 3"}
    if err := writeLines(lines, "foo.out.txt"); err != nil {
        log.Fatalf("writeLines: %s", err)
    }
}

This function creates a file, writes the lines to the file using a bufio.Writer, and flushes the writer to ensure all data is written to the file.

These functions provide a simple and effective way to read and write text files into and out of a string array in Go.

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