Home » Couldn’t understand this SWIFT Fucntion [closed]

Couldn’t understand this SWIFT Fucntion [closed]

Solutons:


You’re getting 120 because you’re asking the tuple for the sum value twice. The tuple passed back is (min: Int, max: Int, sum: Int). In this case, sum is also index number 2 (min is index zero, max is index one). So in this case statistics.sum == statistics.2

If you want to access min or max you can access them using statistics.min or statistics.max respectively. You can also use statistics.0 or statistics.1 if you prefer (I recommend using the labels though).

Final thought: I would change your initial assignment of max and min inside the function to read as follows:

guard var max = scores.first, var min = scores.first else {
   return (0, 0, 0)
}

This will protect against the user accidentally passing an empty array.

You could have also set min and max to 0 ,not to scores[0].
This func is very simple, I think you should read somewhere How functions are working.
For loop is used to go through every element, in your case every element in array scores. In every iteration, variable sum is increased by current element in array. So:
At the beginning of the function : sum = 0
1. iteration: sum = 0 + 5
2. iteration: sum = 5 + 3
3. iteration: sum = 8 + 100
4. iteration: sum = 108 + 3
5. iteration: sum = 111 + 9
For loop ends. Sum = 120.

Score in Scores means like every single element in score. So name Score can be whatever you want to name it. You could have also name it element , x, a or whatever you like.

The function returns a tuple of type (min: Int, max: Int, sum: Int).
max and min are not determined before being calculated. When they’re first assigned at the top of the function, they just contain the first element of the passed in scores array. But by the time the loop below finishes, they indeed have the correct minimum and maximum values. Those values are then returned in a tuple matching the return type.

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