7.6 Clicking on Objects and 51.1 A* Pathfinding algorithm

Hi, my question is how do you click on a single cell in a say 120 x 160 grid?

I have 2 functions. One is activated when clicking on the grid:

```
function mousePressed(){
for (var i = 0; i < cols; i++) {
for (var j = 0; j < rows; j++) {
grid[i][j].clicked();
}
}
}
```
The other function activates for each cell:
```
this.clicked = function() {
var d = dist(mouseX, mouseY, this.i, this.j);
if(d < 1){
console.log("f", this.f);
}
}
```

Is there an efficient way to go about this? I can't wrap my head around how to solve this.. I'd appreciate any feedback, please. Thank you.