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Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today. # Going a bit nuts here...

Whats wrong with my code? I keep getting this error:

Type '(Int) -> [Point]' does not conform to protocol 'Sequence'

on this line of code:

```for point in availablePositions {
```

Here is my code:

```struct Point {
let x: Int
let y: Int

init(x: Int, y: Int) {
self.x = x
self.y = y
}

func surroundingPoints(withRange range: Int = 1) -> [Point] {
var results: [Point] = []

for xCoord in (x-range)...(x+range) {

for yCoord in (y-range)...(y+range) {
let coordinatePoint = Point (x: xCoord, y: yCoord)
results.append(coordinatePoint)
}
}
return results
}
}

let coordinatePoint = Point(x: 2, y: 2)
coordinatePoint.surroundingPoints()

let coordinatePoint2 = Point(x: 3, y: 3)

class Enemy {
var life: Int = 2
let position: Point

init(x: Int, y: Int) {
self.position = Point (x: x, y: y)
}

func decreaseHealth (factor: Int) {
life = life - factor
}
}

class Tower {
let position: Point
var range: Int = 1
var strength: Int = 1

init (x: Int, y: Int) {
self.position = Point(x: x, y: y)

func fireAtEnemy (enemy: Enemy) {
if inRange(position: self.position, range: self.range, target: enemy.position) {
while enemy.life > 0 {
enemy.decreaseHealth(factor: self.strength)
print("Enemy Vanquished!")

}
} else {
print("Darn!! Missed")

}
}

func inRange(position: Point, range: Int, target: Point) -> Bool {

let availablePositions = position.surroundingPoints
(withRange: range)
for point in availablePositions {
if (point.x == target.x) && (point.y == target.y) {
return true
}
}
return false

}
}

let tower = Tower(x: 0, y: 0)
let enemy = Enemy(x: 1, y: 1)

tower.fireAtEnemy(enemy)
```

try replacing your code with this:

struct Point { let x: Int let y: Int

```init(x: Int, y: Int) {
self.x = x
self.y = y
}

func surroundingPoints(withRange range: Int = 1) -> [Point] {
var results: [Point] = []
for xCoord in (x-range)...(x+range) {
for yCoord in (y-range)...(y+range) {
let coordinatePoint = Point(x: xCoord, y: yCoord)
results.append(coordinatePoint)
}
}
return results

}
```

}

let coordinatePoint = Point(x: 2, y: 2) coordinatePoint.surroundingPoints()

class Enemy { var life = 2 let position: Point

```init(x: Int, y: Int) {
self.position = Point(x: x, y: y)
}
func decreaseHealth(factor: Int) {
life -= factor

}
```

}

class Tower { let position: Point var range: Int = 1 var strength: Int = 1

```init(x: Int, y: Int) {
self.position = Point(x: x, y: y)
}

func fireAtEnemy(enemy: Enemy) {
if inRange(initialPosition: self.position, range: self.range, target: enemy.position) {
while enemy.life > 0 {
enemy.decreaseHealth(factor: self.strength)
print("Enemy vanquished!")
}
} else {
print("Darn! The enemy is out of range!")
}

}

func inRange(initialPosition: Point, range: Int, target: Point) -> Bool{

let availablePositions = position.surroundingPoints(withRange:  range)
for Point in availablePositions {
if (Point.x == target.x) && (Point.y == target.y) {
return true
}
}

return false

}

}
```