CODEWITHSUNDEEP
ruby-on-railsrubyjson
tMTboss
tMTboss

Reputation: 171

Get and add values from JSON

Here is my Hash:

{"graph"=>[{"1"=>16, "2"=>44, "3"=>53, "4"=>53, "5"=>80, "6"=>71, "7"=>63, "8"=>54, "9"=>53, "10"=>44, "11"=>76, "12"=>82, "13"=>66, "14"=>59, "15"=>64, "16"=>39, "17"=>19, "18"=>14, "19"=>5, "20"=>6, "21"=>5, "22"=>7, "23"=>6, "24"=>7}]}

I'm trying to get the values of each and add them together. The long and incorrect way would be to get each value and add them together like so:

first_number = json["graph"][0]["1"]
second_number = json["graph"][0]["2"]

How can I simplify this to get that total count?

Upvotes: 0

Views: 169

Answers (1)

nzifnab
nzifnab

Reputation: 16092

If all you need is the sum of those values...

json['graph'][0].values.inject{|sum,val| sum+val}

If you are using rails, you have the option to use the sum method instead:

json['graph'][0].values.sum

inject takes a given block and executes the block once for every element in the Array. val is the current value being evaluated, and sum is the value that was last returned from the block. Thus, if you add the two every time the block runs, and return the result, you will get a sum of your values at the end of execution.

You can see the documentation here: http://apidock.com/ruby/Enumerable/inject

Upvotes: 6

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