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Let’s say, we have an array of objects with each object having exactly two properties, x and y that represent the coordinates of a point. We have to write a function that takes in this array and an object with x and y coordinates of a point and we have to sort the points (objects) in the array according to the distance from the given point (nearest to farthest).

It is a mathematical formula that states that the shortest distance between two points (x1, y1) and (x2, y2) in a two-dimensional plane is given by −

$S=\sqrt{((x2-x1)^2+(y2-y1)^2)}$

We will be using this formula to calculate the distance of each point from the given point and sort them according to that.

const coordinates = [{x:2,y:6},{x:14,y:10},{x:7,y:10},{x:11,y:6},{x:6,y:2}]; const distance = (coor1, coor2) => { const x = coor2.x - coor1.x; const y = coor2.y - coor1.y; return Math.sqrt((x*x) + (y*y)); }; const sortByDistance = (coordinates, point) => { const sorter = (a, b) => distance(a, point) - distance(b, point); coordinates.sort(sorter); }; sortByDistance(coordinates, {x: 5, y: 4}); console.log(coordinates);

The output in the console will be −

[ { x: 6, y: 2 }, { x: 2, y: 6 }, { x: 7, y: 10 }, { x: 11, y: 6 }, { x: 14, y: 10 } ]

And this is in fact the correct order as (6, 2) is nearest to (5,4), then comes (2, 6) then (7, 10) and so on.

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