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+/**
+ * The Koch snowflake is a fractal curve and one of the earliest fractals to have been described.
+ * The Koch snowflake can be built up iteratively, in a sequence of stages. The first stage is an
+ * equilateral triangle, and each successive stage is formed by adding outward bends to each side of
+ * the previous stage, making smaller equilateral triangles. This can be achieved through the
+ * following steps for each line: 1. divide the line segment into three segments of equal length. 2.
+ * draw an equilateral triangle that has the middle segment from step 1 as its base and points
+ * outward. 3. remove the line segment that is the base of the triangle from step 2. (description
+ * adapted from https://en.wikipedia.org/wiki/Koch_snowflake ) (for a more detailed explanation and
+ * an implementation in the Processing language, see
+ * https://natureofcode.com/book/chapter-8-fractals/ #84-the-koch-curve-and-the-arraylist-technique
+ * ).
+ */
+
+/*
+Doctests
+Test iterate-method
+> iterate([new Vector2(0, 0), new Vector2(1, 0)], 1)[0];
+{"x": 0, "y": 0}
+> iterate([new Vector2(0, 0), new Vector2(1, 0)], 1)[1];
+{"x": 1/3, "y": 0}
+> iterate([new Vector2(0, 0), new Vector2(1, 0)], 1)[2];
+{"x": 1/2, "y": Math.sin(Math.PI / 3) / 3}
+> iterate([new Vector2(0, 0), new Vector2(1, 0)], 1)[3];
+{"x": 2/3, "y": 0}
+> iterate([new Vector2(0, 0), new Vector2(1, 0)], 1)[4];
+{"x": 1, "y": 0}
+*/
+
+/** Class to handle the vector calculations. */
+class Vector2 {
+  constructor (x, y) {
+    this.x = x
+    this.y = y
+  }
+
+  /**
+   * Vector addition
+   *
+   * @param vector The vector to be added.
+   * @returns The sum-vector.
+   */
+  add (vector) {
+    const x = this.x + vector.x
+    const y = this.y + vector.y
+    return new Vector2(x, y)
+  }
+
+  /**
+   * Vector subtraction
+   *
+   * @param vector The vector to be subtracted.
+   * @returns The difference-vector.
+   */
+  subtract (vector) {
+    const x = this.x - vector.x
+    const y = this.y - vector.y
+    return new Vector2(x, y)
+  }
+
+  /**
+   * Vector scalar multiplication
+   *
+   * @param scalar The factor by which to multiply the vector.
+   * @returns The scaled vector.
+   */
+  multiply (scalar) {
+    const x = this.x * scalar
+    const y = this.y * scalar
+    return new Vector2(x, y)
+  }
+
+  /**
+   * Vector rotation (see https://en.wikipedia.org/wiki/Rotation_matrix)
+   *
+   * @param angleInDegrees The angle by which to rotate the vector.
+   * @returns The rotated vector.
+   */
+  rotate (angleInDegrees) {
+    const radians = angleInDegrees * Math.PI / 180
+    const ca = Math.cos(radians)
+    const sa = Math.sin(radians)
+    const x = ca * this.x - sa * this.y
+    const y = sa * this.x + ca * this.y
+    return new Vector2(x, y)
+  }
+}
+
+/**
+ * Method to render the Koch snowflake to a canvas.
+ *
+ * @param canvasWidth The width of the canvas.
+ * @param steps The number of iterations.
+ * @returns The canvas of the rendered Koch snowflake.
+ */
+function getKochSnowflake (canvasWidth = 600, steps = 5) {
+  if (canvasWidth <= 0) {
+    throw new Error('canvasWidth should be greater than zero')
+  }
+
+  const offsetX = canvasWidth / 10.0
+  const offsetY = canvasWidth / 3.7
+  const vector1 = new Vector2(offsetX, offsetY)
+  const vector2 =
+      new Vector2(canvasWidth / 2, Math.sin(Math.PI / 3) * canvasWidth * 0.8 + offsetY)
+  const vector3 = new Vector2(canvasWidth - offsetX, offsetY)
+  const initialVectors = []
+  initialVectors.push(vector1)
+  initialVectors.push(vector2)
+  initialVectors.push(vector3)
+  initialVectors.push(vector1)
+  const vectors = iterate(initialVectors, steps)
+  return drawToCanvas(vectors, canvasWidth, canvasWidth)
+}
+
+/**
+ * Utility-method to render the Koch snowflake to a canvas.
+ *
+ * @param vectors The vectors defining the edges to be rendered.
+ * @param canvasWidth The width of the canvas.
+ * @param canvasHeight The height of the canvas.
+ * @returns The canvas of the rendered edges.
+ */
+function drawToCanvas (vectors, canvasWidth, canvasHeight) {
+  const canvas = document.createElement('canvas')
+  canvas.width = canvasWidth
+  canvas.height = canvasHeight
+
+  // Draw the edges
+  const ctx = canvas.getContext('2d')
+  ctx.beginPath()
+  ctx.moveTo(vectors[0].x, vectors[0].y)
+  for (let i = 1; i < vectors.length; i++) {
+    ctx.lineTo(vectors[i].x, vectors[i].y)
+  }
+  ctx.stroke()
+
+  return canvas
+}
+
+/**
+ * Go through the number of iterations determined by the argument "steps". Be careful with high
+ * values (above 5) since the time to calculate increases exponentially.
+ *
+ * @param initialVectors The vectors composing the shape to which the algorithm is applied.
+ * @param steps The number of iterations.
+ * @returns The transformed vectors after the iteration-steps.
+ */
+function iterate (initialVectors, steps) {
+  let vectors = initialVectors
+  for (let i = 0; i < steps; i++) {
+    vectors = iterationStep(vectors)
+  }
+
+  return vectors
+}
+
+/**
+ * Loops through each pair of adjacent vectors. Each line between two adjacent vectors is divided
+ * into 4 segments by adding 3 additional vectors in-between the original two vectors. The vector
+ * in the middle is constructed through a 60 degree rotation so it is bent outwards.
+ *
+ * @param vectors The vectors composing the shape to which the algorithm is applied.
+ * @returns The transformed vectors after the iteration-step.
+ */
+function iterationStep (vectors) {
+  const newVectors = []
+  for (let i = 0; i < vectors.length - 1; i++) {
+    const startVector = vectors[i]
+    const endVector = vectors[i + 1]
+    newVectors.push(startVector)
+    const differenceVector = endVector.subtract(startVector).multiply(1 / 3)
+    newVectors.push(startVector.add(differenceVector))
+    newVectors.push(startVector.add(differenceVector).add(differenceVector.rotate(60)))
+    newVectors.push(startVector.add(differenceVector.multiply(2)))
+  }
+
+  newVectors.push(vectors[vectors.length - 1])
+  return newVectors
+}
+
+// plot the results if the script is executed in a browser with a window-object
+if (typeof window !== 'undefined') {
+  const canvas = getKochSnowflake()
+  document.body.append(canvas)
+}