Swift: Sort Array of Objects with Multiple Criteria | Learn How Now

Sorting an array of objects by multiple criteria can be a challenging task, but with Swift, it can be done easily and efficiently. In order to sort an array of objects by multiple criteria, you can use the `sorted` method with a custom closure.

First, let's create a sample array of objects that we want to sort:

let objects = [
    Object(name: "John", age: 25, height: 175),
    Object(name: "Jane", age: 30, height: 160),
    Object(name: "Bob", age: 20, height: 180),
    Object(name: "Sarah", age: 25, height: 165)
]

In this example, the `Object` class has three properties: `name`, `age`, and `height`. We want to sort the `objects` array first by `age`, and then by `height` if two objects have the same `age`.

To do this, we can use the `sorted` method with a custom closure that compares the `age` properties of two objects first, and then compares the `height` properties if the `age` properties are equal:

let sortedObjects = objects.sorted {
    if $0.age == $1.age {
        return $0.height < $1.height
    } else {
        return $0.age < $1.age
    }
}

In this closure, `$0` and `$1` represent two objects that are being compared. If the `age` properties of the two objects are equal, we compare the `height` properties using the `<` operator. Otherwise, we compare the `age` properties using the same operator. Now, the `sortedObjects` array contains the same objects as the `objects` array, but in the order that we specified. In conclusion, sorting an array of objects by multiple criteria in Swift can be accomplished using the `sorted` method with a custom closure. By comparing the desired properties in the closure, you can specify the order in which the objects should be sorted.