How to Output Numbers with Thousands Commas in Go\'s fmt.Printf?

Outputting Numbers with Thousands Comma in Go's fmt.Printf

Go's fmt.Printf function provides formatting options for outputting various data types. However, it does not have an explicit support for adding thousands commas to numbers.

Overcoming the Absence of Commas

To add thousands commas to numbers, a third-party library, such as golang.org/x/text/message, can be utilized. This library enables the formatting of numbers according to localized conventions.

Implementation

To use golang.org/x/text/message for outputting numbers with thousands commas:

1. First, import the library:

   <code class="go">import (
    "golang.org/x/text/language"
    "golang.org/x/text/message"
   )</code>

2. Create a new message.Printer object, specifying the desired language for formatting:

   <code class="go">p := message.NewPrinter(language.English)</code>

3. Call the Printf method on the message.Printer object, passing in the number to be formatted:

   <code class="go">p.Printf("%d\n", 1000)</code>

Example

The following example prints the number 1000 with thousands commas using golang.org/x/text/message:

<code class="go">package main

import (
    "golang.org/x/text/language"
    "golang.org/x/text/message"
)

func main() {
    p := message.NewPrinter(language.English)
    p.Printf("%d\n", 1000)

    // Output:
    // 1,000
}</code>

By using golang.org/x/text/message, it becomes possible to conveniently output numbers with thousands commas, adhering to localized formatting conventions for different languages.

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