https://github.com/ferdypruis/go-luhn

Create or validate a Lühn (mod 10) check digit in a numeric string in Go.
https://github.com/ferdypruis/go-luhn

checksum go golang luhn mod10

Last synced: 5 months ago
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Create or validate a Lühn (mod 10) check digit in a numeric string in Go.

• Host: GitHub
• URL: https://github.com/ferdypruis/go-luhn
• Owner: ferdypruis
• License: mit
• Created: 2019-11-19T15:08:24.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2021-12-17T16:59:41.000Z (over 4 years ago)
• Last Synced: 2025-08-14T17:54:20.315Z (10 months ago)
• Topics: checksum, go, golang, luhn, mod10
• Language: Go
• Homepage:
• Size: 18.6 KB
• Stars: 2
• Watchers: 1
• Forks: 4
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# go-luhn

[![Build Status](https://travis-ci.com/ferdypruis/go-luhn.svg?branch=master)](https://travis-ci.com/ferdypruis/go-luhn)

[![Go Reference](https://pkg.go.dev/badge/github.com/ferdypruis/go-luhn.svg)](https://pkg.go.dev/github.com/ferdypruis/go-luhn)

Create or validate a Lühn (mod 10) check digit in a numeric string in Go.

## Examples

Checksum returns the Lühn check digit for number.

```go

number := "7992739871"

checkdigit, _ := luhn.Checksum(number) // Ignoring error for simplicity

fmt.Println("The Lühn check digit for", number, "is", checkdigit)

// Output:

// The Lühn check digit for 7992739871 is 3

```

Sign returns number with its Lühn check digit appended

```go

number := "7992739871"

number, _ = luhn.Sign(number) // Ignoring error for simplicity

fmt.Println("Your account number is", number)

// Output:

// Your account number is 79927398713

```

Valid returns whether number verifies against its appended check digit

```go

number := "79927398713"

if luhn.Valid(number) {

    fmt.Println("The number is valid")

} else {

    fmt.Println("The number is not valid")

}

// Output:

// The number is valid

```