// sorted(by:) method accepts a closure that takes two arguments of the same type as the array’s contents

let names = ["Chris", "Alex", "Ewa", "Barry", "Daniella"]

// 1. Write a function that of the correct type: (String, String) -> Bool.
func backward(_ s1: String, _ s2: String) -> Bool {
    return s1 > s2
}

var reversedNames = names.sorted(by: backward)
// reversedNames is equal to ["Ewa", "Daniella", "Chris", "Barry", "Alex"]

// 2. Closure Expression Syntax

// { (parameters) -> return type in
//     statements
// } 


// for the inline closure expression, the "parameters and return type are written inside the curly braces", not outside of them.
var reversedNames = names.sorted(by: {(_ s1: String, _ s2: String) -> Bool in
    return s1 > s2
})


// We write this in JS
var reversedNames = names.sort((s1: string, s2: string): boolean => {
    return s1 > s2;
});

// Inferring Type From Context
var reversedNames = names.sorted(by: { $0 > $1 } )