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clarification
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Leaf
  • 521
  • 4
  • 7

Kustom, 67 bytes

This makes use of the fact that an undefined global variable works as empty string. The extra byte is for the name of the defined global variable.

$fl(1,tc(len,gv(n)),"i+1","tc(lpad,gv(x),i,tc(cut,gv(n),i-1,1))")$ 

Sort of ungolfed:

$fl( 1, tc(len, gv(input)), "i + 1", "tc( lpad, gv(undefined), i, tc( cut, gv(input), i - 1, 1 ) )" )$ 

Kustom, 67 bytes

This makes use of the fact that an undefined global variable works as empty string. The extra byte is for the name of the global variable.

$fl(1,tc(len,gv(n)),"i+1","tc(lpad,gv(x),i,tc(cut,gv(n),i-1,1))")$ 

Sort of ungolfed:

$fl( 1, tc(len, gv(input)), "i + 1", "tc( lpad, gv(undefined), i, tc( cut, gv(input), i - 1, 1 ) )" )$ 

Kustom, 67 bytes

This makes use of the fact that an undefined global variable works as empty string. The extra byte is for the name of the defined global variable.

$fl(1,tc(len,gv(n)),"i+1","tc(lpad,gv(x),i,tc(cut,gv(n),i-1,1))")$ 

Sort of ungolfed:

$fl( 1, tc(len, gv(input)), "i + 1", "tc( lpad, gv(undefined), i, tc( cut, gv(input), i - 1, 1 ) )" )$ 
Source Link
Leaf
  • 521
  • 4
  • 7

Kustom, 67 bytes

This makes use of the fact that an undefined global variable works as empty string. The extra byte is for the name of the global variable.

$fl(1,tc(len,gv(n)),"i+1","tc(lpad,gv(x),i,tc(cut,gv(n),i-1,1))")$ 

Sort of ungolfed:

$fl( 1, tc(len, gv(input)), "i + 1", "tc( lpad, gv(undefined), i, tc( cut, gv(input), i - 1, 1 ) )" )$