N-dimensional Euclidean distance

distance.ts

/**
 * Calculates the euclidean distance between two N-dimensional
 * points, represented as arrays of length N.
 */
export function euclideanDistance<P extends [number, ...number[]]>(
  p1: P,
  p2: P,
): number {
  if (p1.length === 1) {
    return Math.abs(p1[0] - p2[0]);
  }

  let sumOfSquaredDistances = 0;
  for (let i = 0; i < p1.length; i++) {
    sumOfSquaredDistances += Math.pow(p1[i] - p2[i], 2);
  }
  return Math.sqrt(sumOfSquaredDistances);
}