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g=
n=>`f=_=>"".padEnd(${n}*((""+f).length+2))`

o.innerText=(h=n=>`Function: ${x=g(n)}\nLength:   ${x.length}\nOutput:   "${x=eval(x)()}"\nLength:   `+x.length)(i.value=10);oninput=_=>o.innerText=h(+i.value)

<input id=i type=number><pre id=o>