code: function drawVerticalGridLines() {
              maskGridLines = svg.select('.grid-lines-group')
                  .selectAll('line.horizontal-grid-line')
                  .data(yScale.ticks(yTicks).slice(1))
                  .enter()
                    .append('line')
                      .attr('class', 'horizontal-grid-line')
                      .attr('x1', (xAxisPadding.left))
                      .attr('x2', chartWidth)
                      .attr('y1', (d) => yScale(d))
                      .attr('y2', (d) => yScale(d))
  
              drawHorizontalExtendedLine();
          }
docs: Draws the grid lines for a vertical bar chart
  @return {void}