NameError: when calling lambda from irb

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Hi all,
This is my lambda.rb file.  first, I run  irb -r ./lambda_counter.rb load
file  from terminal. then I try call db = new_db.call . I got "NameError:
undefined local variable or method `new_db' for main:Object". i aslo try
load file inside irb, use require 'lambda.rb', it's not working as well.
My os is mac os, ruby is 2.3.3
new_db = lambda do
db ={}
insert = lambda do |artist, album|
db[artist] =album
end
{insert: insert}
end

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<div dir=3D"ltr">Hi all,<div>This is my lambda.rb file.=C2=A0 first, I run=
=C2=A0 irb -r ./lambda_counter.rb load file=C2=A0 from terminal. then I try=
 call db =3D new_db.call . I got &quot;NameError: undefined local variable =
or method `new_db&#39; for main:Object&quot;. i aslo try load file inside i=
rb, use require=C2=A0&#39;lambda.rb&#39;, it&#39;s not working as well.</di=
v><div>My os is mac os, ruby is 2.3.3=C2=A0</div><div><div style=3D"color:r=
gb(212,212,212);background-color:rgb(30,30,30);font-family:Menlo,Monaco,&qu=
ot;Courier New&quot;,monospace;font-size:12px;line-height:18px;white-space:=
pre-wrap"><div><span style=3D"color:rgb(156,220,254)">new_db</span> =3D <sp=
an style=3D"color:rgb(220,220,170)">lambda</span> <span style=3D"color:rgb(=
197,134,192)">do</span> </div><div>  <span style=3D"color:rgb(156,220,254)"=
>db</span> =3D{}</div><div>  <span style=3D"color:rgb(156,220,254)">insert<=
/span> =3D <span style=3D"color:rgb(220,220,170)">lambda</span> <span style=
=3D"color:rgb(197,134,192)">do</span> |<span style=3D"color:rgb(156,220,254=
)">artist</span>, <span style=3D"color:rgb(156,220,254)">album</span>|</div=
><div>    db[<span style=3D"color:rgb(156,220,254)">artist</span>] =3Dalbum=
</div><div>  <span style=3D"color:rgb(197,134,192)">end</span></div><div>  =
{<span style=3D"color:rgb(86,156,214)">insert:</span> <span style=3D"color:=
rgb(156,220,254)">insert</span>}</div><div><span style=3D"color:rgb(197,134=
,192)">end</span></div></div></div></div>

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