從select中刪除哈希項

[英]Delete hash item from within select

本文翻译自 drack 查看原文 2015-05-08 41 ruby

Is there a way to delete a hash item from within a select? I want to check if a file exists in a directory and if it does, remove it from the hash.

有沒有辦法從選擇中刪除哈希項?我想檢查目錄中是否存在文件,如果存在,則將其從哈希中刪除。

hash = {"http://s3-us-west-2.amazonaws.com/packages/ics/ics_4.0.0.tar.gz"=>"5103909285b549eda0b6a13dd503790a", ...}

hash.select do |k,v|
  if File.file?("#{k[/[^\/]+$/]}")
    # Remove from hash

  end
end

1 个解决方案

#1

You cannot delete element in select, delete_if is a good choice.

你不能刪除select中的元素,delete_if是個不錯的選擇。

hash.delete_if { |k,_| File.file?("#{k[/[^\/]+$/]}") }

update:

hash_copy = hash.dup

hash.select do |k,v|
  if File.file?("#{k[/[^\/]+$/]}")
    hash_copy.delete(k)
    ......
  end
end

注意！

本站翻译的文章，版权归属于本站，未经许可禁止转摘，转摘请注明本文地址：https://www.itdaan.com/blog/2015/05/08/7257306753154c363f2dc97dc979f335.html。

select and delete from hash in ruby Delete an item from a dictionary PHP - Delete Item from Hash Table (array) using array_filter Delete duplicates from a hash? [duplicate] How to delete an item from this listbox? Delete an item from Redux state Delete item from listview and database Delete an item from oneToMany relationship ruby select inner hash from nested hash How to delete from select in MySQL?