Swift Dictionary keys

var languages = ["Swift": 2012, "C": 1972, "Java": 1995]

// return just the keys of languages
var result = languages.keys

print(result)

// Output: ["C", "Swift", "Java"]

keys Syntax

The syntax of the dictionary keys property is:

dictionary.keys 

Here, dictionary is an object of the Dictionary class.

keys Return Values

The keys property returns an array of all the keys of dictionary.

Example 1: Swift Dictionary keys

var information = ["Alcaraz": 18, "Sinner": 20, "Nadal": 34]

// keys total elements on names 
print(information.keys)
  

Output

["Sinner", "Nadal", "Alcaraz"]

In the above example, we have used the keys property to return an array of just the keys of the information dictionary.

Example 2: Using keys With for Loop

var informations = ["Alcaraz": 18, "Sinner": 20, "Nadal": 34]

// iterate through all the keys of informations 
for  information in informations.keys {
    print(information)
}

Output

Nadal
Alcaraz
Sinner

Here, we have used the for loop to iterate through all the keys of the informations dictionary.

Finally, all the keys of informations are printed one at a time.