Is there a way to pull the values from an array and assign them each a unique key in Ruby?
I want to be able to turn this array:
["12", "21", "1985"]
Into this hash:
{:month => "12", :day => "21", :year => "1985"}
I would rather not assign each value individually, like this:
arr = ["12", "21", "1985"]
bday_hash = {:month => arr[0], :day => arr[1], :year => arr[2]}
You can use #zip
your_array = ["12", "21", "1985"]
keys = ['month', 'day', 'year']
keys.zip(your_array).to_h
to_h is not supported. Use Hash[keys.zip(values)] as suggested by @MikDiet below.You can take array of keys, zip it with values and then convert to hash
keys = [:month, :day, :year]
values = ["12", "21", "1985"]
Hash[keys.zip(values)]
# => {:month=>"12", :day=>"21", :year=>"1985"}
.to_hash, which on hashes just returns self. And I misread the code at first and thought the conversion is done via "key value pairs" route, which would involve one intermediate hash and one array. Still it's better to use literals in cases like that one. :)Here are two other ways to obtain the desired hash.
arr_values = ["12", "21", "1985"]
arr_keys = [:month, :day, :year]
[arr_keys, arr_values].transpose.to_h
#=> {:month=>"12", :day=>"21", :year=>"1985"}
arr_keys.each_index.with_object({}) { |i, h| h[arr_keys[i]] = arr_values[i] }
#=> {:month=>"12", :day=>"21", :year=>"1985"}
I added a method to Array to facilitate this sort of conversion.
class Array
def fold_into_hash(values)
result = {}
self.each_with_index do |key, index|
result[key] = values[index]
end
result
end
end
month_day_year = [:month, :day, :year]
#...
puts month_day_year.fold_into_hash(["12", "21", "1985"])
yields this result:
{:month=>"12", :day=>"21", :year=>"1985"}
zip and to_h or Hash[] will do it faster.
ary = ["12", "21", "1985"]; h = { month: ary[0], day: ary[1], year: ary[2] }