[ACCEPTED]-Get key value pair of hash for the given key , in ruby-ruby
There is a method, Hash#assoc can do similar 5 things. But it returns the key and value 4 in an array, which you can easily change 3 it into a hash. And an alternative is use 2 Hash#select, which does return a hash according 1 to the block given.
h1 = { "fish" => "aquatic animal", "tiger" => "big cat" }
h1.assoc "fish" # ["fish", "aquatic animal"]
h1.select { |k,v| k == "fish" } # {"fish"=>"aquatic animal"}
in ruby >= 1.9
value_hash = Hash[*h1.assoc(k1)]
p value_hash # {"fish"=>"aquatic animal"}
in ruby < 1.9
value_hash = Hash[k1, h1[k1]]
p value_hash # {"fish"=>"aquatic animal"}
0
The most easy and native way are using the 3 method slice.
h1 = { fish: 'aquatic animal', tiger: 'big cat', dog: 'best human friend' }
k1 = :fish
Just do it:
h1.slice(k1)
# => {:fish=>"aquatic animal"}
And better, you can use 2 multiples keys for this, for example, to 1 k1, and k3
k1 = :fish
k3 = :dog
h1.slice(k1, k3)
# => {:fish=>"aquatic animal", :dog=>"best human friend"}
Clear, easy and efficiently
Simplest answer:
def find(k1)
{k1 => h1[k1]}
end
this will return {'fish' => 'aquatic 3 animal'} which is what you need.
no need 2 to jump through hoops to get they key, since 1 you already have it! :-)
I got a workaround, by creating a new hash, from 2 the key value pair, and then outputting 1 its value by using puts h1
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