Find & Replace elements in array of hashes - Ruby [duplicate]

Question

I have an array of hashes as below

status_arr = [{id: 5, status: false}, 
              {id: 7, status: false}, 
              {id: 3, status: false},
              {id: 9, status: false} ]

I would like to update the hash with status: true if it has ids 5, 7

update_ids = [5, 9]

I am trying the following and has no idea to proceed

status_arr.select{ |arr| update_ids.include?(arr[:id]) arr[:status] = true}

Expected output:

status_arr = [{id: 5, status: true}, 
              {id: 7, status: false}, 
              {id: 3, status: false},
              {id: 9, status: true} ]

You are actually very close you could just change this status_arr.select{ |arr| update_ids.include?(arr[:id]) arr[:status] = true} to status_arr.select{ |arr| update_ids.include?(arr[:id])}.each{|arr| arr[:status] = true} or status_arr.each{ |arr| arr[:status] = update_ids.include?(arr[:id]) } — engineersmnky
– engineersmnky, Commented Sep 6, 2018 at 13:27
You can do this. status_arr.select{ |arr| arr[:status] = true if update_ids.include?(arr[:id])} — Mayur Shah
– Mayur Shah, Commented Sep 6, 2018 at 13:32
status_arr.map { |h| h.merge(status: [5,9].include?(h[:id])) } — Aleksei Matiushkin
– Aleksei Matiushkin, Commented Sep 6, 2018 at 13:44

fl00r · Accepted Answer · 2018-09-06 13:30:17Z

1

require 'set'
update_ids = Set.new([5,3])
status_arr.map{ |s| s[:status] = update_ids.include?(s[:id]); s }
#=> [{:id=>5, :status=>true}, {:id=>7, :status=>false}, {:id=>3, :status=>true}, {:id=>9, :status=>false}]

instead of Set you can use just a Hash

update_ids = {5 => true, 3=> true}
status_arr.map{ |s| s[:status] = update_ids.include?(s[:id]); s }
#=> [{:id=>5, :status=>true}, {:id=>7, :status=>false}, {:id=>3, :status=>true}, {:id=>9, :status=>false}]

Or an array, but it will have some performance issues for big arrays

update_ids = [5,3]
status_arr.map{ |s| s[:status] = update_ids.include?(s[:id]); s }
#=> [{:id=>5, :status=>true}, {:id=>7, :status=>false}, {:id=>3, :status=>true}, {:id=>9, :status=>false}]

answered Sep 6, 2018 at 13:30

fl00r

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