Generating SVG path data for a star in JavaScript

genStarPathData.js

const genStarPathData = (points,cx,cy,radius) => {
   let radii = {
     outer : radius, // this will be given to us when the function is called,
     inner : radius * Math.cos(2 * Math.PI / points) / Math.cos(Math.PI /points)
     /*
     Wait, why Math.PI instead of 360 and 180? Well I remembered this time before
     putting too much work in - JavaScript works in radians, not degrees!
     π radians = 180° */
   };
   /* Now to redo the whole methodology as we can't really have an xpoints and
   ypoints array, we don't know how many of each there will be! */
   /* For each point we will have 2 coordinates, so let's create an array of
   points, each with an x and y property: */
   let pointsArray = [];
   for (let i = 1; i <= points; i++) {
     if (i == 1) {
       pointsArray.push({
         x: cx,
         y: cy - radius
       });
     } else {
       pointsArray.push({
         x: cx + (radii.outer * Math.sin(2 * i * Math.PI / points)),
         y: cy - (radii.outer * Math.cos(2 * i * Math.PI / points))
       });
     }
     pointsArray.push({
       x: cx + (radii.inner * Math.sin((2 * i + 1) * Math.PI / (2 * points))),
       y: cy - (radii.inner * Math.cos((2 * i + 1) * Math.PI / (2 * points)))
     });
   };
   let pathString = pointsArray
                      .slice(1)
                      .reduce(
                        (accumulator,current) => accumulator + `L${current.x} ${current.y} `,
                        `M${pointsArray[0].x} ${pointsArray[0].y} `
                      ) + 'Z';
   return pathString;
}