Ruby Hash to array of values
RubyArraysHashRuby Problem Overview
I have this:
hash = { "a"=>["a", "b", "c"], "b"=>["b", "c"] }
and I want to get to this: [["a","b","c"],["b","c"]]
This seems like it should work but it doesn't:
hash.each{|key,value| value}
=> {"a"=>["a", "b", "c"], "b"=>["b", "c"]}
Any suggestions?
Ruby Solutions
Solution 1 - Ruby
Also, a bit simpler....
>> hash = { "a"=>["a", "b", "c"], "b"=>["b", "c"] }
=> {"a"=>["a", "b", "c"], "b"=>["b", "c"]}
>> hash.values
=> [["a", "b", "c"], ["b", "c"]]
Solution 2 - Ruby
I would use:
hash.map { |key, value| value }
Solution 3 - Ruby
hash.collect { |k, v| v }
#returns [["a", "b", "c"], ["b", "c"]]
Enumerable#collect takes a block, and returns an array of the results of running the block once on every element of the enumerable. So this code just ignores the keys and returns an array of all the values.
The Enumerable module is pretty awesome. Knowing it well can save you lots of time and lots of code.
Solution 4 - Ruby
hash = { :a => ["a", "b", "c"], :b => ["b", "c"] }
hash.values #=> [["a","b","c"],["b","c"]]
Solution 5 - Ruby
It is as simple as
hash.values
#=> [["a", "b", "c"], ["b", "c"]]
this will return a new array populated with the values from hash
if you want to store that new array do
array_of_values = hash.values
#=> [["a", "b", "c"], ["b", "c"]]
array_of_values
#=> [["a", "b", "c"], ["b", "c"]]
Solution 6 - Ruby
There is also this one:
hash = { foo: "bar", baz: "qux" }
hash.map(&:last) #=> ["bar", "qux"]
Why it works:
The & calls to_proc on the object, and passes it as a block to the method.
something {|i| i.foo }
something(&:foo)