storing coordinates in array in javascript

I want to store coordinates into an array in javascript, I am new to javascript and do not have an idea how to do it.

Any help would be appreciated.

5 Answers

There are a number of ways to store x,y coordinates:

Option 1 (every other index in an array):

function storeCoordinate(x, y, array) { array.push(x); array.push(y); } var coords = []; storeCoordinate(3, 5, coords); storeCoordinate(19, 1000, coords); storeCoordinate(-300, 4578, coords); coords[0] == 3 // x value (even indexes) coords[1] == 5 // y value (odd indexes) // to loop through coordinate values for (var i = 0; i < coords.length; i+=2) { var x = coords[i]; var y = coords[i+1]; } 

Option 2 (simple object in an array):

function storeCoordinate(xVal, yVal, array) { array.push({x: xVal, y: yVal}); } var coords = []; storeCoordinate(3, 5, coords); storeCoordinate(19, 1000, coords); storeCoordinate(-300, 4578, coords); coords[0].x == 3 // x value coords[0].y == 5 // y value // to loop through coordinate values for (var i = 0; i < coords.length; i++) { var x = coords[i].x; var y = coords[i].y; } 

Well, let's say we make it simple, you want to store coördinates, so we have x and y:

function coordinate(x, y) { this.x = x; this.y = y; } 

This is how you create Objects in javascript, they act like functions. With this function you can create your coordinates. Then all you need to do is create an array:

var arr = new Array(); arr.push(new coordinate(10, 0)); arr.push(new coordinate(0, 11)); 

That's it basically

The push method would do the job:

var arr = new Array();

arr.push({ x : x_coordinate, y : y_coordinate });

You can then access them by using

arr[0].x (gives the x coordinate)

and

arr[0].y (gives the y coordinate).

Hope it helps.

These answers are not usable if you're trying to store a grid/matrix that you wanted to access data point by x,y values later.

var coords = []; for(y=0; y < rows; y++){ for(x=0;x<cols; x++){ if(typeof coords[x] == 'undefined']){ coords[x] = []; } coords[x][y] = someValue; } } //accessible via coords[x][y] later 

I saw a way to store coordinates using a Set. By using a Set you can store unique coordinates which can come in handy at times.

let coords = new Set(); coords.add(x + "," + y)