Get the distance between points

distance-between-points.js

var points = [
  {x: 4, y: 3},
  {x: 5, y: 2},
  {x: 6, y: 1},
  {x: 7, y: 0},
  {x: 8, y: -1},
  {x: 8, y: 9},
  {x: 1, y: 1},
  {x: 9, y: -4}
];

var currentPosition = {x: 0, y: 0};

function distanceBtwPoint (position, reference) {
  return Math.sqrt(Math.pow((position.x-reference.x),2)+Math.pow((position.y-reference.y),2))
}

function getNearestPosition (currentPosition, points) {
  var lowestDistance = null;
  var nearestPosition;
  points.forEach(function (point, key) {
    var distance = distanceBtwPoint(currentPosition, point);
    if (lowestDistance === null || lowestDistance > distance) {
      lowestDistance = distance;
      nearestPosition = key;
    }
  });
  return nearestPosition;
};

getNearestPosition(currentPosition, points); // Should display 6

distance-between-two-point.js

function distance (position, reference) {
  return Math.sqrt(Math.pow((position.x-reference.x),2)+Math.pow((position.y-reference.y),2))
}

distance({x: 0, y: 0}, {x: 3, y: 4}); // Should return 5