# Module: Sjekksum::Primitive

Extended by:
Primitive, Shared
Included in:
Primitive
Defined in:
lib/sjekksum/primitive.rb

## Overview

Module for calculation and validation of Primitive checksums

The primitive checksum is just a reduced digit sum (modulo 9).

## Instance Method Details

### #convert(number) ⇒ Integer, StringAlso known as: transform

Transforms a number by appending the Primitive checksum digit

Examples:

``Sjekksum::Primitive.convert(232323) #=> 2323236``

Parameters:

• number (Integer, String)

number without a checksum

Returns:

• (Integer, String)

final number including the checksum

 ``` 51 52 53 54``` ```# File 'lib/sjekksum/primitive.rb', line 51 def convert number raise_on_type_mismatch number typed_conversion number end```

### #of(number) ⇒ IntegerAlso known as: checksum

Calculates Primitive checksum

Examples:

``Sjekksum::Primitive.of(232323) #=> 6``

Parameters:

• number (Integer, String)

number for which the checksum should be calculated

Returns:

• (Integer)

calculated checksum

 ``` 20 21 22 23``` ```# File 'lib/sjekksum/primitive.rb', line 20 def of number raise_on_type_mismatch number convert_to_int(number) % 9 end```

### #valid?(number) ⇒ BooleanAlso known as: is_valid?

Primitive validation of provided number

Examples:

``Sjekksum::Primitive.valid?(232323) #=> true``

Parameters:

• number (Integer, String)

number with included checksum

Returns:

• (Boolean)
 ``` 35 36 37 38 39``` ```# File 'lib/sjekksum/primitive.rb', line 35 def valid? number raise_on_type_mismatch number num, check = split_number(number) self.of(num) == check end```