How to get a specific output iterating a hash in Ruby

Question

I want to get a specific output iterating a Ruby Hash   This is the Hash I want to iterate over   hash       1   gt    a    b       2   gt    c       3   gt    d    e    f    g       4   gt    h       This is the output I would like to get   1-----  a  b  2-----  c  3-----  d   e  f  g  4-----  h   In Ruby  how can I get such an output with my Hash

User · Answer

The most basic way to iterate over a hash is as follows   hash each do  key  value    puts key   puts value end

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hash keys sort each do  key    puts    key -----    hash key  each    val  puts val   end

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My one line solution   hash each    key  array  puts    key -----   array    I think it is pretty easy to read

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You can also refine Hash  each so it will support recursive enumeration  Here is my version of Hash  each Hash  each pair  with block and enumerator support   module HashRecursive     refine Hash do         def each recursive false   amp block              if recursive                 Enumerator new do  yielder                      self map do  key  value                          value each recursive true  map   key next  value next  yielder  lt  lt    key  key next  flatten  value next    if value is a  Hash                          yielder  lt  lt    key   value                      end                 end entries each  amp block              else                 super  amp block              end         end         alias method  each pair   each      end end  using HashRecursive   Here are usage examples of Hash  each with and without recursive flag   hash          a   gt             b   gt                 c   gt  1               d   gt   2  3  4                      e   gt  5             f   gt  6    p hash each  hash each     hash each size     lt Enumerator    a  gt   b  gt   c  gt 1   d  gt  2  3  4     e  gt 5    f  gt 6  each gt      a  gt   b  gt   c  gt 1   d  gt  2  3  4     e  gt 5    f  gt 6    2  p hash each true   hash each true      hash each true  size     lt Enumerator      a   b   c   1      a   b   d    2  3  4       a   b     c  gt 1   d  gt  2  3  4        a   e   5      a     b  gt   c  gt 1   d  gt  2  3  4     e  gt 5       f   6   each gt        a   b   c   1      a   b   d    2  3  4       a   b     c  gt 1   d  gt  2  3  4        a   e   5      a     b  gt   c  gt 1   d  gt  2  3  4     e  gt 5       f   6     6  hash each do  key  value      puts    key    gt    value   end   a   gt    b  gt   c  gt 1   d  gt  2  3  4     e  gt 5    f   gt  6  hash each true  do  key  value      puts    key    gt    value   end     a   b   c    gt  1     a   b   d    gt   2  3  4      a   b    gt    c  gt 1   d  gt  2  3  4       a   e    gt  5     a    gt    b  gt   c  gt 1   d  gt  2  3  4     e  gt 5      f    gt  6  hash each pair recursive true  do  key  value      puts    key    gt    value   unless value is a  Hash  end     a   b   c    gt  1     a   b   d    gt   2  3  4      a   e    gt  5     f    gt  6   Here is example from the question itself   hash         1     gt     a    b         2     gt     c         3     gt     a    d    f    g         4     gt     q      hash each recursive false  do  key  value      puts    key    gt    value   end   1   gt    a    b     2   gt    c     3   gt    a    d    f    g     4   gt    q     Also take a look at my recursive version of Hash  merge Hash  merge   here

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hash each do  key  array    puts    key -----    puts array end   Regarding order I should add  that in 1 8 the items will be iterated in random order  well  actually in an order defined by Fixnum s hashing function   while in 1 9 it will be iterated in the order of the literal

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Calling sort on a hash converts it into nested arrays and then sorts them by key  so all you need is this   puts h sort map   k v      k ----     v    And if you don t actually need the  ----  part  it can be just   puts h sort

[ruby] How to get a specific output iterating a hash in Ruby?

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