Calculate nearest points

nearestPoints.js

const distance = (point1, point2) => {
  return Math.sqrt(Math.pow(point2[0] - point1[0], 2) + Math.pow(point2[1] - point1[1],2))
}

const nearestPoints = (basePoint, pointList, numberOfNearestWanted) => {
  const pointDistances = pointList.map(point => {
    return {
      point,
      distance: distance(basePoint, point)
    }
  })
  pointDistances.sort((prevPoint, nextPoint) => prevPoint.distance - nextPoint.distance)
  return pointDistances.slice(0, numberOfNearestWanted)
}

// Tests

const point1 = [0,0]
const point2 = [0,1]

console.log(distance(point1, point2)) // 1

const points = [point1, point2, [4,6], [12,32]]

console.log(nearestPoints(point1, points, 2))