irb.shell.log

% irb

# Newer hash literal
2.3.5 :001 > h1 = { name: 'hash1' }
 => {:name=>"hash1"}
2.3.5 :002 > h1['name']
 => nil
2.3.5 :003 > h1[:name]
 => "hash1"

# Old-school hash literal
2.3.5 :004 > h2 = { :name => 'hash2' }
 => {:name=>"hello"}
2.3.5 :005 > h2['name']
 => nil
2.3.5 :006 > h2[:name]
 => "hash2"

# JSON
2.3.5 :007 > require 'json'
 => true
2.3.5 :008 > h3 = JSON.parse '{"name":"hash3"}'
 => {:name=>"hash3"}
2.3.5 :009 > h3['name']
 => "hash3"
2.3.5 :010 > h3[:name]
 => nil

# Then mix…
2.3.5 :011 > h4 = JSON.parse('{"name":"hash4"}').merge({ name: 'symobled hash4'})
 => {"name"=>"hash4", :name=>"symobled hash4"}
2.3.5 :012 > JSON.parse(h4.to_json)
 => {"name"=>"symobled hash4"}