1. One-Liner If-Else Operator

Did you know that you can replace this simple if-else statement:

let money = 100
if money > 0 {
    print("Some money")
} else {
    print("No money")
}

With this neat little one-liner expression?

money > 0 ? print("Some money") : print("No money")

This is an operator known as a ternary conditional operator in Swift (it’s a common feature in other programming languages too).

Here is the general structure of a ternary conditional:

condition ? true_expression : false_expression

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2. Swap Two Variables Without a Helper

In order to swap two variables without a helper variable, you can utilize tuple destructuring:

var a = 1
var b = 2
(a, b) = (b, a)
print(a, b)

Output:

2 1

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3. Check for Nils in Optional Values

You don’t need to write if-else statements to check if an optional value is nil. Instead, you can use a nil coalescing operator, ?? , to achieve the same with just one line of code:

var name: String?
print(name ?? "N/A")

Output:

N/A

Nil coalescing is a commonly used feature in Swift. It works by checking if the left-hand side of ?? is nil. If it is, then it returns the value on the right-hand side. Otherwise, it returns the value on the left. In other words, print(name ?? "N/A") is just a nice shorthand for:

var name: String?

if name != nil {
    print(name)
} else {
    print("N/A")
}

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4. Check if a Word Exists in a Sentence

You can check if a particular word exists in a string with a simple one-liner:

let favorites = ["Banana", "Orange", "Apple"] 
let bag = "I packed some Beef, Potatoes, and a Banana"

let hasFavorite = !favorites.filter({bag.contains($0)}).isEmpty
print(hasFavorite)

Output:

true

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5. Sum All Numbers Up to a Number

For example, sum up numbers from 1 to 10:

let sum = (1...10).reduce(0,+)
print(sum)

Output:

55

Conclusion

Thanks for reading. Happy coding!