> For the complete documentation index, see [llms.txt](https://demirels-organization.gitbook.io/javascript-tutorial/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://demirels-organization.gitbook.io/javascript-tutorial/plus-+-operator/strategy-game-example.md).

# Strategy Game Example

Here is an example of how the `+` and `+=` operators might be used in the context of a strategy game:

```javascript
let playerResources = 50;

function gatherResources(gathered) {
  playerResources += gathered;
  console.log(`You have gathered ${gathered} resources. Your total is now ${playerResources}.`);
}

gatherResources(20); // Outputs "You have gathered 20 resources. Your total is now 70."
gatherResources(30); // Outputs "You have gathered 30 resources. Your total is now 100."

let unitCost = 10;
let unitsToCreate = 3;

if (playerResources >= unitCost * unitsToCreate) {
  playerResources -= unitCost * unitsToCreate;
  console.log(`You have created ${unitsToCreate} units. Your resources are now ${playerResources}.`);
} else {
  console.log(`You do not have enough resources to create ${unitsToCreate} units.`);
}
```

In this example, we have a variable called `playerResources` that stores the number of resources that the player has. We have a function called `gatherResources` that adds a given amount of resources to the player's total.

We also have a few variables called `unitCost` and `unitsToCreate` that store the cost and number of units that the player wants to create. We use the `+` operator to add the gathered resources to the player's total, and we use the `+=` operator to update the player's total after units are created.

Finally, we use an `if` statement to check if the player has enough resources to create the desired number of units. If they do, we use the `*` operator to calculate the total cost and the `-=` operator to subtract the cost from the player's resources. If they don't have enough resources, we display a message to the player


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