Find element index in an array in Perl 6

Question

How can I find the index of an element within an array?

For example, given

my @weekdays = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'];

How could I find the index for 'Thursday'?

Awesome! In cases like this, you can post both a question and an answer at the same time. — Christopher Bottoms
– Christopher Bottoms, Commented May 9, 2018 at 12:28

Christopher Bottoms · Accepted Answer · 2018-05-09 15:59:04Z

9

My initial solution:

@weekdays.kv.reverse.hash.{'Thursday'} # 3

Then JFerrero posted his improvement solution using antipairs:

@weekdays.antipairs.hash.{'Thursday'} # 3

And ultimatto posted an adverb solution:

@weekdays.first('Thursday', :k)  # 3

edited May 9, 2018 at 15:59

Christopher Bottoms

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answered May 9, 2018 at 15:01

chenyf

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Comments

moritz · Accepted Answer · 2018-05-10 16:12:37Z

8

You can use first (or grep, if you want to know about all matches, not just the first one) with :k to return the key (which for a list is always an Integer index) instead of the value:

say @weekdays.first('Tuesday', :k);  # 1

answered May 10, 2018 at 16:12

moritz

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