How Can I Efficiently Load Entire Files into Strings in Go?

Efficiently Loading Entire Files into String Variables in Go

Many applications often encounter situations where they need to handle numerous small files and require a method to read their contents into a string variable. Fortunately, the Go programming language provides a straightforward solution to this task.

Utilizing ioutil.ReadFile

The ioutil package offers a convenient function called ReadFile that allows users to read the contents of an entire file into a byte slice ([]byte). Here's an example of how to use it:

import "io/ioutil"

func main() {
    fileContent, err := ioutil.ReadFile("myfile.txt")
    if err != nil {
        // handle read error
    }
}

Converting to String

The data returned by ReadFile is a byte slice, not a string. To convert it to a string, use the string() function:

fileContentStr := string(fileContent)

Note: The ioutil package is now deprecated as of Go 1.16. Its functionality has been moved to io or os packages. For new code, the updated answer provided below is recommended.

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