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;
} 

2

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

3

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

1

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)

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