SYNOPSIS
# Append all 245 subfields to my.title
marc_map('245','my.title')
# Append an array of 245 subfields to the my.title array
marc_map('245','my.title', split:1)
# Copy the 245-$a$b$c subfields into the my.title hash in the order provided in the record
marc_map('245abc','my.title')
# Copy the 245-$c$b$a subfields into the my.title hash in the order c,b,a
marc_map('245cba','my.title', pluck:1)
# Copy the 100 subfields into the my.authors array
marc_map('100','my.authors.$append')
# Add the 710 subfields into the my.authors array
marc_map('710','my.authors.$append')
# Copy the 600-$x subfields into the my.subjects array while packing each into a genre.text hash
marc_map('600x','my.subjects.$append.genre.text')
# Copy the 008 characters 35-35 into the my.language hash
marc_map('008_/35-35','my.language')
# Copy all the 600 fields into a my.stringy hash joining them by '; '
marc_map('600','my.stringy', join:'; ')
# When 024 field exists create the my.has024 hash with value 'found'
marc_map('024','my.has024', value:found)
# Do the same examples now with the marc fields in 'record2'
marc_map('245','my.title', record:record2)
# Copy all 100 subfields except the digits to the 'author' field
marc_map('100^0123456789','author')
# Map all the 500 - 599 fields to my.notes
marc_map('5**','my.motes')
# Map the 100-a field where indicator-1 is 3
marc_map('100[3]a','name.family')