/**
  Codegolf flexcercise:
  Create a field with randomly selected tiles, using unicode characters.
  
  fun tilesets (copy paste in console, preload t with the string):
    ["\u2550","\u2551","\u2557","\u255A","\u255D","\u2560","\u2563","\u2566","\u2569","\u256C"," "]
    ["\u2571","\u2572"," "]
    ["\u2500", "\u2502","\u250C", "\u2510", "\u2514", "\u2518","\u251C","\u2524", "\u252C", "\u2534", "\u253C"]

  q	-	The string we're building
  s - 	string length
  f - 	total field length (number of lines)
  t - 	tileset
  c -	line counter
  n - 	character counter

  2019-01-04: 130 bytes (108chr.)
*/

for(q="",s=f=32,t=[...'─│┌┐└┘├┤┬┴┼'],c=0;c<=f/2;c++){for(n=0;n<=s;n++)q+=t[Math.random()*t.length|0];q+="\n"}