Store coordinates from prompt and calculate the distance

Question

I work on distance calculation between coordinates and I built something which works fine.

var pointsCoordinates = [[5,7],[5,8],[2,8],[2,10]];
function lineDistance(points) {
  var globalDistance = 0;
  for(var i=0; i<points.length-1; i++) {
    globalDistance += Math.sqrt(Math.pow( points[i+1][0]-points[i][0] , 2 ) + Math.pow( points[i+1][1]-points[i][1] , 2 ));
  }
  return globalDistance;
}

console.log(lineDistance(pointsCoordinates));

I would like to improve it a little bit and send a prompt to store coordinates sent by users.

example:

alert(prompt("send me random coordinates in this format [,] and I will calculate the distance))

I would like to store theses coordinates and calculate the distance with my function which works.

I know I have to use push but it doesn't works, someone can help me to write it? I know it's simple but... I can't do it.

Thank you very much

Answer 1

var userPrompt = prompt("send me random coordinates");// e.g [100,2] [3,45] [51,6]
var pointsCoordinates = parseCoordinates(userPrompt);

function parseCoordinates(unparsedCoord) {
    var arr = unparsedCoord.split(" ");
    var pair;
    for (var i = 0; i < arr.length; i++) {
        pair = arr[i];
        arr[i] = pair.substr(1, pair.length - 2).split(",")
    }
    return arr;
}

function lineDistance(points) {
    var globalDistance = 0;
    for(var i = 0; i < points.length - 1; i++) {
        globalDistance += Math.sqrt(Math.pow(points[i + 1][0] - points[i][0], 2) + Math.pow(points[i+1][1]-points[i][1], 2));
    }
    return globalDistance;
}

console.log(pointsCoordinates);
console.log(lineDistance(pointsCoordinates));