Struct broken down... I think. Please correct and collaborate!

struct Point {
    let x: Int // these *stored properties* have no value assigned to them - that comes later
    let y: Int // their job is to name the constant, and define its type.

    /// Returns the surrounding points in range of
    /// the current one
    func points(inRange range: Int = 1) -> [Point] {    // Here we are creating a new function within the struct, with a default value of 1
                                                        // We have then specified the return type as being an array of Point instances

        var results = [Point]() // Here we declare a new variable of type Point, and assign an empty array. We'll eventually assign
                                // coordinates to this array. It's a variable because we need to mutate it throughout this process.

        let lowerBoundOfXRange = x - range // get the lower bound numbers of the origin x point and assign them to a constant
        let upperBoundOfXRange = x + range // get the upper bound numbers of the origin x point and assign them to a constant

        let lowerBoundOfYRange = y - range // get the lower bound numbers of the origin y point and assign them to a constant
        let upperBoundOfYRange = y + range // get the upper bound numbers of the origin y point and assign them to a constant

        /*
         now we start a loop which will go through all of the x values and y values and create a new constant containing the values based on the custom type Point. this constant is then added (appended) to the above "results" variable, and the loop continues until all points have been collected and added to the results array.
        */
        for xCoordinate in lowerBoundOfXRange...upperBoundOfXRange {
            for yCoordinate in lowerBoundOfYRange...upperBoundOfYRange {
                let coordinatePoint = Point(x: xCoordinate, y: yCoordinate)
                results.append(coordinatePoint)
            }
        }

        return results // finally, the function returns the results array ready for calling back later
    }
}

let playerPosition = Point(x: 1, y: 2) // so we have to create a new instance of the Point type, declarun the object's position
let enemyPosition = Point(x: 4, y: 4)  // each time we want to use this struct and method within

playerPosition.points() // now we can simply call the points method each time we want to get the surrounding points
enemyPosition.points()  // for that instance

enemyPosition.points(inRange: 3) // We can also define a custom range, instead of using the default