Deleting a hash from array of hashes in Ruby

Question

I have an array of hashes as following:

[{\"k1\"=>\"v1\", \"k2\"=>\"75.1%\"}, {\"k1\"=>\"v2\", \"k2\"=>\"-NA-\"}, {\"k1\"=>\"v3\", \"k2\"=>         


        

Answer 1

Use Array#delete_if:

arr = [{"k1"=>"v1", "k2"=>"75.1%"}, {"k1"=>"v2", "k2"=>"-NA-"}, {"k1"=>"v3", "k2"=>"5.1%"}]

arr.delete_if { |h| h["k1"] == "v3" }
#=> [{"k1"=>"v1", "k2"=>"75.1%"}, {"k1"=>"v2", "k2"=>"-NA-"}]

If there is no hash matching the condition, the array is left unchanged.

Answer 2

You can do this with Array#reject(If you don't want to modify the receiver) and also with Array#reject!(If you want to modify the receiver)

arr = [{"k1"=>"v1", "k2"=>"75.1%"}, {"k1"=>"v2", "k2"=>"-NA-"}, {"k1"=>"v3", "k2"=>"5.1%"}]
p arr.reject { |h| h["k1"] == "v3" }
# >> [{"k1"=>"v1", "k2"=>"75.1%"}, {"k1"=>"v2", "k2"=>"-NA-"}]    

arr = [{"k1"=>"v1", "k2"=>"75.1%"}, {"k1"=>"v2", "k2"=>"-NA-"}, {"k1"=>"v3", "k2"=>"5.1%"}]
p arr.reject! { |h| h["k1"] == "v3" }
# >> [{"k1"=>"v1", "k2"=>"75.1%"}, {"k1"=>"v2", "k2"=>"-NA-"}]