functions that return booleans( true or false), can end with a question mark
( ? )
and in ruby what is called a hash is a list of key value pairs, that is
:name => "abder", :id=> '3'
that is a hash, if i want the value of name , call it like this
:name
that returns "abder", and hashes can be nested, like this
:params=> { :name => "abder", :id=> '3'}
if i cal params directly i get ,
:name => "abder", :id=> '3'
but if i want a value that is nested i do
params[:name]
and it returns
"abder"
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