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### How do I Loop over multiple arrays simultaneously ?

by Fox (Pilgrim)
 on Feb 25, 2010 at 16:54 UTC Need Help??
Contributed by Fox on Feb 25, 2010 at 16:54 UTC
Q&A  > arrays

#### Description:

Taken from RosettaCode...

How do I loop over multiple arrays and print the ith element of each?

For example, looping over the arrays (a,b,c), (A,B,C) and (1,2,3) to produce the output:

```aA1
bB2
cC3

 Answer: How do I Loop over multiple arrays simultaneously ?contributed by Fox And the answer from RosettaCode: ```sub zip (&@) { my \$code = shift; my \$min; \$min = \$min && \$#\$_ > \$min ? \$min : \$#\$_ for @_; for my \$i ( 0 .. \$min ) { \$code->( map \$_->[\$i] , @_ ); } } my @a1 = qw( a b c ); my @a2 = qw( A B C ); my @a3 = qw( 1 2 3 ); zip { print @_,"\n" } \( @a1, @a2, @a3 ); [download]``` This implementation will stop producing items when the shortest array ends. Answer: How do I Loop over multiple arrays simultaneously ?contributed by jdporter use List::MoreUtils::each_array: ```use List::MoreUtils qw( each_array ); my @a = qw( a b c ); my @b = qw( A B C ); my @c = qw( 1 2 3 ); my \$ea = each_array( @a, @b, @c ); while ( my( \$a, \$b, \$c ) = \$ea->() ) { print \$a, \$b, \$c; } [download]``` :-) Answer: How do I Loop over multiple arrays simultaneously?contributed by gaurav.trikha Well, assuming that it's certain that the arrays are all the same length, just translate the statement of the problem into Perl: have an index going the length of one of them, and then use it in all of them: ```my @a = qw( a b c ); my @b = qw( A B C ); my @c = qw( 1 2 3 ); for my \$i ( 0 .. \$#a ) { print \$a[\$i], \$b[\$i], \$c[\$i]; } [download]```

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