The first property returns the first key/value pair of the dictionary.
Example
var languages = ["Swift": 2012, "C": 1972, "Java": 1995]
// return total elements of languages
var result = languages.first
print(result)
// Output: (key: "Swift", value: 2012)
first Syntax
The syntax of the dictionary first property is:
dictionary.first
Here, dictionary is an object of the Dictionary class.
first Return Values
The first property returns the first key/value present in the dictionary.
Note: The first property returns an optional value, so we need to unwrap it. There are different techniques to unwrap optionals. To learn more about optionals, visit Swift Optionals.
Example: Swift Dictionary first
var nameAge = ["Alcaraz": 18, "Sinner": 20, "Nadal": 34]
// first key/value pair of nameAge
print(nameAge.first!)
var employees = ["Saby": 1994]
// return first key/value pair of employees
print(employees.first!)
Output
(key: "Alcaraz", value: 18) (key: "Saby", value: 1994)
In the above example, we have created two dictionaries named nameAge and employees with 3 and 1 key/value pairs respectively.
Here, we have used the first property to return the first key/value pair from nameAge and employees respectively.