code39 static method
Code 39 Barcode
The Code 39 specification defines 43 characters, consisting of uppercase letters (A through Z), numeric digits (0 through 9) and a number of special characters (-, ., $, /, +, %, and space).
An additional character (denoted '*') is used for both start and stop delimiters.
Implementation
static Barcode code39() => const BarcodeCode39();