iOS repl.it - Optionals Challenge Solution

optionals.swift

//Don't change this
var studentsAndScores = ["Amy": Int(readLine()!)!, "James": Int(readLine()!)!, "Helen": Int(readLine()!)!]

func highestScore(scores: [String: Int]) {
  
  //Write your code here.
  let a = studentsAndScores["Amy"]!
  let b = studentsAndScores["James"]!
  let c = studentsAndScores["Helen"]!
  
  var temp = 0
  //If a is greater than b
  if a > temp {
    //And a is also greater than c
    temp = a
  }
    
  if b > temp {
    temp = b
  }
  
  if c > temp {
    temp = c
  }
  
  print(temp)
  
  
}

//Don't change this
highestScore(scores: studentsAndScores)

There is no need to create a variable called temp

var studentsAndScores = ["Amy": Int(readLine()!)!, "James": Int(readLine()!)!, "Helen": Int(readLine()!)!]

func highestScore(scores: [String: Int]) {

// Store the scores and force unwrap it

 let a = studentsAndScores["Amy"]!
 let b = studentsAndScores["James"]!
 let c = studentsAndScores["Helen"]!
    
// Create a nested if statement

    if a > b{
         if a > c{
             print(a)
         }
     }
     if b > c{
         if b > a{
             print(b)
         }
     }
     if c > a{
         if c > b{
             print(c)
         }
     }
}

Here's how I solved this exercise:

//Don't change this
var studentsAndScores = ["Amy": Int(readLine()!)!, "James": Int(readLine()!)!, "Helen": Int(readLine()!)!]

func highestScore(scores: [String: Int]) {

//Write your code here.
let a = studentsAndScores["Amy"]!
let b = studentsAndScores["James"]!
let c = studentsAndScores["Helen"]!

if a > b && a > c {
print(a)
} else if b > a && b > c {
print(b)
} else {
print(c)
}

}

// List of students with their scores
var studentsAndScores = ["Amy": 10, "James": 5, "Helen": 7]

// Function that takes a dictionary as a parameter to find and print the highest score among students
func highestScore(scores: [String: Int]) {
    print(studentsAndScores.values.max()!)
}

// We call the function and pass studentsAndScores dictionary as an argument
highestScore(scores: studentsAndScores) // Output: 10