My Chessboard Exercise solution from the Eloquent JS book.

Eloquent JS - Chessboard Exercise

/* This is the way I found to solve it. There are probably easier ways to do this. I am a total beginner */

var boardwidth = 8, boardheight = 5, board = "";

for ( i = 0 ; i < boardheight ; i++ ) {
  
  for ( f = 0 ; f < boardwidth ; f++ ) {

    if ( f % 2 === 0 )
      board += " ";

    else
      board += "#";
      
  }
  
  if ( i % 2 === 0) {
      board += "\n ";
  }
  
  else {
      board += "\n";
  }

}

console.log(board)