code: function ones( len ) {
  	var out = new Array( len ),
  		i;
  
  	for ( i = 0; i < len; i++ ) {
  		out[ i ] = 1;
  	}
  	return out;
  }
docs: end FUNCTION filter() 
  FUNCTION: ones( len )
  Creates a 1D array filled with 1s.
  
  @private
  @param {Number} len - array length
  @returns {Number[]} ones array