How do I call a function with parameters? - swift

Question

I am using xcode playgrounds toying around with some code and I get this error Use of unresolved identifier 'colorArray' when I try to call a function. How do I fix this I know it has to be simple.
import Foundation
class Solution{
var colorArray = ["Red","blue","green","black","red","blue","yellow","purple","Red","Red","Red","yellow","yellow","black","green","black","purple","black","yellow","purple","purple","blue","yellow","blue","green","green","yellow","pink"]
func getMostCommonColor(array: [String]) -> [String] {
var topColors: [String] = []
var colorDictionary: [String: Int] = [:]
for color in array {
if let count = colorDictionary[color] {
colorDictionary[color] = count + 1
}else{
colorDictionary[color] = 1
}
}
let highestValue = colorDictionary.values.max()
for (color,count) in colorDictionary {
if colorDictionary[color] == highestValue {
topColors.append(color)
}
}
return topColors
}
}
let solution = Solution()
solution.getMostCommonColor(array: colorArray) //This is where I get the error

Answer 1

The way you've defined it, colorArray is an instance property of Solution, meaning you need to access it through some instance of the Solution class.
You've already created an instance down below, so you could do this:
let solution = Solution()
solution.getMostCommonColor(array: solution.colorArray)
However, I suspect you meant for colorArray to be a global variable of sorts (since this is just a playground, after all), so another option is to move colorArray out of the Solution class:
var colorArray = ["Red","blue","green","black","red","blue","yellow","purple","Red","Red","Red","yellow","yellow","black","green","black","purple","black","yellow","purple","purple","blue","yellow","blue","green","green","yellow","pink"]
class Solution {
func getMostCommonColor(array: [String]) -> [String] {
var topColors: [String] = []
var colorDictionary: [String: Int] = [:]
for color in array {
if let count = colorDictionary[color] {
colorDictionary[color] = count + 1
}else{
colorDictionary[color] = 1
}
}
let highestValue = colorDictionary.values.max()
for (color,count) in colorDictionary {
if colorDictionary[color] == highestValue {
topColors.append(color)
}
}
return topColors
}
}
let solution = Solution()
solution.getMostCommonColor(array: colorArray)