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module#2 (Mahmud) #38

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module#2 (Mahmud) #38

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8414b55
add poison feature
Mahmud-007 Apr 16, 2022
5cb5ace
add addObject and removeObject function for adding and removing foods…
Mahmud-007 Apr 22, 2022
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62 changes: 55 additions & 7 deletions pages/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@ const CellType = {
Snake: "snake",
Food: "food",
Empty: "empty",
Poison: "poison",
};

const Direction = {
Expand Down Expand Up @@ -40,6 +41,15 @@ const Cell = ({ x, y, type, remaining }) => {
transform: `scale(${0.5 + remaining / 20})`,
};

case CellType.Poison:
return {
backgroundColor: "blue",
borderRadius: 20,
width: 32,
height: 32,
transform: `scale(${0.5 + remaining / 20})`,
};

default:
return {};
}
Expand Down Expand Up @@ -100,6 +110,7 @@ const useSnake = () => {
const [direction, setDirection] = useState(getInitialDirection());

const [foods, setFoods] = useState([]);
const [poisons, setPoisons] = useState([]);

const score = snake.length - 3;

Expand All @@ -110,6 +121,7 @@ const useSnake = () => {
const resetGame = useCallback(() => {
setFoods([]);
setDirection(getInitialDirection());
setPoisons([]);
}, []);

const removeFoods = useCallback(() => {
Expand All @@ -119,26 +131,50 @@ const useSnake = () => {
);
}, []);

const removePoisons = useCallback(() => {
setPoisons((currentPoisons) =>
currentPoisons.filter(
(poison) => Date.now() - poison.createdAt <= 10 * 1000
)
);
}, []);

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we can create a reusable removeObject(type) function like addObject

// ?. is called optional chaining
// see: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining
const isFood = useCallback(
({ x, y }) => foods.some((food) => food.x === x && food.y === y),
({ x, y }) => foods.find((food) => food.x === x && food.y === y),
[foods]
);
const isPoison = useCallback(
({ x, y }) => poisons.find((poison) => poison.x === x && poison.y === y),
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food and poison are basically the same but different types. We can check food or poison with the same function.

[poisons]
);

const isSnake = useCallback(
({ x, y }) =>
snake.find((position) => position.x === x && position.y === y),
[snake]
);

const isAllowedCell = useCallback(
(newCell) => isSnake(newCell) || isFood(newCell || isPoison(newCell)),
[isFood, isPoison, isSnake]
);
const addFood = useCallback(() => {
let newFood = getRandomCell();
while (isSnake(newFood) || isFood(newFood)) {
while (isAllowedCell(newFood)) {
newFood = getRandomCell();
}
setFoods((currentFoods) => [...currentFoods, newFood]);
}, [isFood, isSnake]);
}, [isAllowedCell]);

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@MahdiMurshed MahdiMurshed Apr 17, 2022 •
edited
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basically addFood and addPoison does the same job .So we can make a reusable function like

const addObject= useCallback((type) => {
    let newObj= getRandomCell();
    while (isAllowedCell(newObj)) {
      newObj= getRandomCell();
    }
     if(type===CellType.Food){
     setFoods((currentFoods) => [...currentFoods, newObj]);
     }else{
     setPoisons(currentPoison=>[...currentPoison,newObj]);
  }
      
  }, [isAllowedCell]);

when calling

  useInterval(()=>addObject(CellType.Food), 3000);
  useInterval(()=>addObject(CellType.Poison), 3000);

const addPoison = useCallback(() => {
let newPoison = getRandomCell();
while (isAllowedCell(newPoison)) {
newPoison = getRandomCell();
}
setPoisons((currentPoisons) => [...currentPoisons, newPoison]);
}, [isAllowedCell]);

// move the snake
const runSingleStep = useCallback(() => {
Expand All @@ -156,8 +192,8 @@ const useSnake = () => {
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax
const newSnake = [newHead, ...snake];

// reset the game if the snake hit itself
if (isSnake(newHead)) {
// reset the game if the snake hit itself or poison
if (isSnake(newHead) || isPoison(newHead)) {
resetGame();
return getDefaultSnake();
}
Expand All @@ -176,11 +212,13 @@ const useSnake = () => {

return newSnake;
});
}, [direction, isFood, isSnake, resetGame]);
}, [direction.x, direction.y, isFood, isPoison, isSnake, resetGame]);

useInterval(runSingleStep, 200);
useInterval(runSingleStep, 1);
useInterval(addFood, 3000);
useInterval(removeFoods, 100);
useInterval(addPoison, 3000);
useInterval(removePoisons, 100);

useEffect(() => {
const handleDirection = (direction, oppositeDirection) => {
Expand Down Expand Up @@ -231,6 +269,16 @@ const useSnake = () => {
);
} else if (isSnake({ x, y })) {
type = CellType.Snake;
} else if (isPoison({ x, y })) {
type = CellType.Poison;
remaining =
10 -
Math.round(
(Date.now() -
poisons.find((poison) => poison.x === x && poison.y === y)
.createdAt) /
1000
);
}
cells.push(
<Cell key={`${x}-${y}`} x={x} y={y} type={type} remaining={remaining} />
Expand Down