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Kevin Walker
2,354 PointsWhere does x and y value come from?
In the video after Pasan has written everything out, including the two For Loops, where does the initial value of x and y come from? How is the loop calculating the "for xCoord in (x-range)...(x+range)" if we don't set x to, say, 0?
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
}
}
1 Answer
Cindy Lea
Courses Plus Student 6,497 PointsThe values will come when the parameters get passed from the calling function. Here the code is for defining the functions & the variable space, but not values yet.
Harold Davis
Courses Plus Student 14,604 PointsHarold Davis
Courses Plus Student 14,604 Pointsbecause it does not need to know what x is yet it will know when you pas numbers through it like so :
//when you call the Point struct Point(x: 10, y: 20)
then because of the "surroundingPoints" function built in. The point also knows the surrounding points and you can call that later i believe he will talk more about it. hope that makes some since.