The GTIN gem provides very simple functionality for verifying checksums on EAN-13 and UPC-A barcode values. It also does very simple conversion between the two by left-padding with zeroes. This is not intended to be a complex gem, but is certainly functional for applications that require that barcode values be checked for valid checksums and length.
Inspired by the EAN gem by Pascal Belloncle (nano RAILS)
'731346000101'.ean? ==> false '731346000101'.upc? ==> true
'731346000101'.to_ean ==> '0731346000101' '731346000101'.to_gtin ==> '000731346000101'
'0731346000101'.valid_checksum? ==> true '0731346000105'.valid_checksum? ==> false Also adds .odd? and .even? to the Integer class
sudo gem install gtin
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