2D Grid for objects in Swift

gistfile1.swift

struct Grid<T> {
    
    var array : Array<Array<T>>
    let rows : Int
    let columns : Int
    
    init(rows : Int, columns : Int, initialValue: T) {
        self.rows = rows
        self.columns = columns
        self.array = Array<Array<T>>()
        
        for row in 0...rows {
            array.append(Array(count: self.columns, repeatedValue: initialValue))
        }
    }
    
    subscript(row : Int, column : Int) -> T {
        get {
            return self.array[row][column]
        }
        set(value) {
            self.array[row][column] = value
        }
    }
}