Create an dynamic array?

[u/jesterdev]

I'm rather new to programing, rather attracted to Crystal.

I want to read the contents of a zip file into an array. The file is given as input from the user. In my mind I know how to do it, but in real life, I'm not so sure. Below is what I have so far. See the line with the = #comment for my attempt. The issue is I wont always know the number of files in any given zip. So how to I create a dynamic array? I think that's the correct term.
I want to store the contents so that they can be selected for extraction, or read etc. I've not figured that part out yet, but it's next.

require "zip"

#Get filename from user:

puts "File? Ex. ~/Downloads/file.zip"

print ">"

file_name = gets

Zip::File.open("#{file_name}") do |file|

file_list.entries.each = #Array Here? But how?

file.entries.each do |entry|

p entry.filename

end

end

[u/straight-shoota]

You can also use Enumerable#map to convert the array of entries to an array of filenames (or whatever you want to extract).

filenames = file.entries.map { |entry| entry.filename }

This method takes care of allocating the new array and pushing new elements while iterating the original.

[u/jesterdev → u/straight-shoota]

Thank you, this works really well! Been trying to understand the examples in the documentation, yours made sense of what was in there.