Make all arrays of hash to have same size

Ruby
1

Hello to all,

First post in Ruby-Forum. Maybe some Ruby expert could help me.

Does somebody knows how to make all arrays of a hash to have the same
size?
This is, add blank elements to smaller arrays.

I found that for an array of arrays this could be done like this:

array=[[“x”,“y”,“z”], [“w”,“p”], [“q”, “x”, “c”, “v”]]
max_size = array.map(&:size).max
array.map { |a| Array.new(max_size) { |i| a[i] || ‘’ } }

Output: [[“x”, “y”, “z”, “”], [“w”, “p”, “”, “”], [“q”, “x”, “c”,“v”]]

For an hash of arrays I’ve been trying to replicate the code above
without succes.

hash = {“1”=>[“x”,“y”,“z”], “2”=>[“w”,“p”], “3”=>[“q”, “x”, “c”, “v”]}
max_size = hash.values.map(&:size).max
myHash.values.map { |k,v| myHash.new(max_size) { |i| a[i] || ‘’ } }

Asked here too
“DEVShed”

Thanks in advance.

2

Von Levix wrote in post #1144459:

Does somebody knows how to make all arrays of a hash to have the same
size?
This is, add blank elements to smaller arrays.

I found that for an array of arrays this could be done like this:

array=[[“x”,“y”,“z”], [“w”,“p”], [“q”, “x”, “c”, “v”]]
max_size = array.map(&:size).max
array.map { |a| Array.new(max_size) { |i| a[i] || ‘’ } }

You are not changing array here. Instead you are creating a copy of all
the Arrays.

Output: [[“x”, “y”, “z”, “”], [“w”, “p”, “”, “”], [“q”, “x”, “c”,“v”]]

For an hash of arrays I’ve been trying to replicate the code above
without succes.

hash = {“1”=>[“x”,“y”,“z”], “2”=>[“w”,“p”], “3”=>[“q”, “x”, “c”, “v”]}
max_size = hash.values.map(&:size).max
myHash.values.map { |k,v| myHash.new(max_size) { |i| a[i] || ‘’ } }

Again, you are not modifying the Hash but you are copying the values
Array which in itself is a copy already. Plus, it is totally unclear
what myHash.new is supposed to do.

Asked here too

“http://forums.devshed.com/ruby-programming-142/arrays-size-adding-blanks-hash-arrays-961236.html”

Why?

irb(main):004:0> hash = {“1”=>[“x”,“y”,“z”], “2”=>[“w”,“p”], “3”=>[“q”,
“x”, “c”, “v”]}
=> {“1”=>[“x”, “y”, “z”], “2”=>[“w”, “p”], “3”=>[“q”, “x”, “c”, “v”]}
irb(main):005:0> max = hash.values.inject(0){|m, a| a.size > m ? a.size
: m}
=> 4
irb(main):006:0> hash.values.each {|a| a << ‘’ while a.size < max}
=> [[“x”, “y”, “z”, “”], [“w”, “p”, “”, “”], [“q”, “x”, “c”, “v”]]
irb(main):007:0> hash
=> {“1”=>[“x”, “y”, “z”, “”], “2”=>[“w”, “p”, “”, “”], “3”=>[“q”, “x”,
“c”, “v”]}

3

Hello Robert,

Many thanks for your help.

It works fine the same solution for array or hash. And I asked before in
other forum and asked here after any answer in the other forum.

Thanks again.

Best regards