Really new to Ruby and just trying to figure out how to remove one specific value from a hash and return a new hash.
So say if I had the hash
{"within" => ["FID6", "S5"], "uri"=>"/repositories/2/raps/7", "is_repository_default"=>false} How would I go about removing the "FID6" value and returning a new hash without that value? I've tried to .delete("within") but that just broke my code.
You can use Hash#transform_values to iterate over each value from the hash, modify them when they're arrays and return a new hash:
data = { "within" => ["FID6", "S5"], "uri"=>"/repositories/2/raps/7", "is_repository_default"=>false } data.transform_values { |value| value.is_a?(Array) ? value - ['FID6'] : value } # {"within"=>["S5"], "uri"=>"/repositories/2/raps/7", "is_repository_default"=>false} Or to map a new hash starting from what you have:
data.map { |key, value| [key, value.is_a?(Array) ? value - ['FID6'] : value] }.to_h # {"within"=>["S5"], "uri"=>"/repositories/2/raps/7", "is_repository_default"=>false} data.to_h { |key, value| [key, value.is_a?(Array) ? value - ['FID6'] : value] } # {"within"=>["S5"], "uri"=>"/repositories/2/raps/7", "is_repository_default"=>false} Hash#to_h accepts a block since Ruby 2.6
shift as it mutates the receiver @jamesc :( (a matter of preference).You can duplicate the hash and assign a new array with the value removed:
hash = { "within" => ["FID6", "S5"], "uri" => "/repositories/2/raps/7", "is_repository_default" => false } new_hash = hash.dup new_hash['within'] -= ['FID6'] new_hash #=> {"within"=>["S5"], "uri"=>"/repositories/2/raps/7", "is_repository_default"=>false} hash #=> {"within"=>["FID6", "S5"], "uri"=>"/repositories/2/raps/7", "is_repository_default"=>false}