{def txt
Given$a$text$file$of$many$lines,$where$fields$within$a$line\$are$delineated$by$a$single$'dollar'$character,$write$a$program\$that$aligns$each$column$of$fields$by$ensuring$that$words$in$each\$column$are$separated$by$at$least$one$space.\$Further,$allow$for$each$word$in$a$column$to$be$either$left\$justified,$right$justified,$or$center$justified$within$its$column.}
-> txt
{def columns                                                 // function's name

 {def columns.r                                               // loop function
  {lambda {:just :a :b}
   {if {A.empty? :a}                                          // end of loop
    then :b                                                   // return the string
    else {columns.r :just                                     // justification
                    {A.rest :a}.                              // loop on next char
                    {if {W.equal? {A.first :a} \}             // if end of line
                     then < tr> :b                            // open a table row
                     else {if {W.equal? {A.first :a} $}       // if space between words
                     then < td style="text-align::just;">:b   // open a table data with justif
                     else {A.first :a}:b }} } }}}             // else add character

 {lambda {:just :txt}                                         // main function
  {table                                                      // open an HTML table
   {columns.r                                                 // call the loop function
              :just                                           // justification
              {A.reverse {A.split ${:txt}}}                   // split and reverse
              .                                               // end point
}}}}
-> columns


{columns left txt}
->  Given	a	text	file	of	many	lines,	where	fields	within	a	line
are	delineated	by	a	single	'dollar'	character,	write	a	program
that	aligns	each	column	of	fields	by	ensuring	that	words	in	each
column	are	separated	by	at	least	one	space.
Further,	allow	for	each	word	in	a	column	to	be	either	left
justified,	right	justified,	or	center	justified	within	its	column..



{columns center txt} and {columns right txt} outputs can be seen in this website: http://lambdaway.free.fr/lambdawalks/?view=align_columns