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.\" ========================================================================
.\"
.IX Title "Catmandu::Fix::Bind::mab_each 3pm"
.TH Catmandu::Fix::Bind::mab_each 3pm "2020-04-02" "perl v5.30.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Catmandu::Fix::Bind::mab_each \- a binder that loops over MAB2 fields
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 6
\&    # Only add field 331 to the title when field 412 matches \*(AqHeise\*(Aq
\&    do mab_each()
\&        if mab_match("412","Heise")
\&            mab_map("331",title)
\&        end
\&    end
\&
\&    # Delete all the 700 subject fields
\&    do mab_each()
\&        if mab_match("700",".*")
\&            reject()
\&        end
\&    end
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The mab_each binder will iterate over each individual \s-1MAB2\s0 field and 
execute the fixes only in context over each individual field.
.PP
If a \s-1MAB2\s0 record contains:
.PP
.Vb 2
\&    705    $a775.05$c775
\&    705    $a702.08$c702
.Ve
.PP
then the fix
.PP
.Vb 3
\&    do mab_each()
\&        mab_map("705a",subject.$append)
\&    end
.Ve
.PP
will have the same effect as
.PP
.Vb 1
\&    mab_map("705a",subject.$append)
.Ve
.PP
because \f(CW\*(C`mab_map\*(C'\fR by default loops over all repeated \s-1MAB2\s0 fields. But the 
\&\f(CW\*(C`mab_each\*(C'\fR bind has the advantage to process fields in context. E.g. to 
only map fields where the subfield \f(CW$c\fR doesn't contain '702' you 
can write:
.PP
.Vb 5
\&    do mab_each()
\&        unless mab_match("705","702")
\&            mab_map("705",subject.$append)
\&        end
\&    end
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Catmandu::Fix::Bind
.SH "AUTHOR"
.IX Header "AUTHOR"
Johann Rolschewski <jorol@cpan.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is copyright (c) 2013 by Johann Rolschewski.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.