Swift - Find highest value in custom class array with multiple variables

Question

I'd like to find the highest value in my array. I found the method .max() in Apples documentation.

let heights = [67.5, 65.7, 64.3, 61.1, 58.5, 60.3, 64.9]
let greatestHeight = heights.max()
print(greatestHeight)
// Prints "Optional(67.5)"

My array has custom datatype. The datatype contains two variables from type integer. How can I find the highest value from one of the variables?

This is my class.

class Example: Codable {

// Variables
var value1: Int
var value2: Int

// Init
init(_value1: Int, _value2: Int) {
    value1 = _value1
    value2 = _value2
}    

}

Answer 1

As you clarified in a comment:

I want to find out the highest value of value1 of all objects in that array

That can be achieved by mapping each object to its value1 and then determining the maximum:

let maxValue1 = examples.map { $0.value1 }.max()

If the given array is really huge then it can be advantageous to use the “lazy variant” to avoid the creation of an intermediate array:

let maxValue1 = examples.lazy.map { $0.value1 }.max()