Calculate the distance between two coordinates

lineDistance.js

function lineDistance(p1, p2) {
  var xs = 0;
  var ys = 0;

  xs = p2.x - p1.x;
  xs = xs * xs;

  ys = p2.y - p1.y;
  ys = ys * ys;

  return Math.sqrt(xs + ys);
}