Add element to a nested hash in ruby

Question

I have a hash:

a = { 21 => { 3 => {:x => 5, :y => 6}}}

I want to add another value to the key '21' so that the hash looks like this:

a = { 21 => { 3 => {:x => 5, :y => 6}, 4 => {:x => 8, :y => 7}}}

How can I do that?

falsetru · Accepted Answer · 2014-12-13 01:20:10Z

2

You want to add an key-value pair to a hash (a[21]). a[21] will give you the inner hash object.

a = { 21 => { 3 => {:x => 5, :y => 6}}}
a[21]
# => {3=>{:x=>5, :y=>6}}

Associating key, values to the inner hash will solve your problem.

a[21][4] = {:x => 8, :y => 7}
a
# => {21=>{3=>{:x=>5, :y=>6}, 4=>{:x=>8, :y=>7}}}

answered Dec 13, 2014 at 0:54

falsetru

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Comments

Cary Swoveland · Accepted Answer · 2014-12-13 01:46:20Z

2

Another way is:

a[21].update({ 4=>{:x => 8, :y => 7} }) 

a #=> {21=>{3=>{:x=>5, :y=>6}, 4=>{:x=>8, :y=>7}}}

answered Dec 13, 2014 at 1:46

Cary Swoveland

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