push new element into array within hash

Question

I have a hash which, I have keys that uniquely identify each element within the hash. And within each element, I have an array. So my question is, how do I put another element inside that array within the hash.

{"Apple"=>[1, 5.99], "Banana"=>[5, 9.99]}

I'm looping through a result set, and I'm a little bit lost how to add another element to the array...

Jordan Running · Accepted Answer · 2010-01-12 03:19:41Z

6

If your hash is called, for example, hsh, then the "Apple" array can be accessed by hsh["Apple"]. You can use this like any variable, so to add a value to that array just do hsh["Apple"] << some_value. Like so:

irb> hsh = { "Apple" => [1, 5.99], "Banana" => [5, 9.99] }
irb> hsh["Apple"] << 9999
=> { "Apple" => [1, 5.99, 9999], "Banana" => [5, 9.99] }

edited Jan 12, 2010 at 3:19

answered Jan 12, 2010 at 3:14

Jordan Running

107k18 gold badges193 silver badges189 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

user211662 Over a year ago

Is there a way that I can order the hash so that lets say the highest price array is first ... while keeping the integrity Cheers for the help btw

Jordan Running Over a year ago

No, in Ruby hashes are unordered, so you cannot "sort" them as such (though this may change in Ruby 1.9). You would need to use a library that extends Hash, like Ruby Facets' Dictionary class: github.com/trans/facets/blob/master/lib/more/facets/…

user2340939 Over a year ago

Is it possible to to do hsh["Apple"] << [9999, 8888], so that you get { "Apple" => [1, 5.99, 9999, 8888], "Banana" => [5, 9.99] }, but without using a loop?

Jordan Running Over a year ago

@user2340939 Use Array#concat: hsh["Apple"].concat([9999, 8888]) or Array#push: hsh["Apple"].push(9999, 8888).

user2340939 Over a year ago

@Jordan I've figured out the first case, but the second one seems handy also.

Collectives™ on Stack Overflow

push new element into array within hash

1 Answer 1

5 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

5 Comments

Your Answer

Sign up or log in

Post as a guest

Related