Print Keys and Values of a Dictionary in Swift

A dictionary is an unordered collection in which data is stored in the form of key-value pairs. To print the keys and values of a dictionary Swift supports the following methods ?

• Using for-in loop

• Using properties

Method 1: Using for-in Loop

To print keys and values of the given dictionary we can use a for-in loop. The for-in loop iterates through each pair of the dictionary and displays them on the output screen.

Syntax

for(key, value) in dict{
   print("\(key) = \(value)")
}

Here, the key represents the key and value represents the associated value of the current key and the dict represents the dictionary.

Example

In the following Swift program, we will print a dictionary. So, we will create a dictionary with key-value pairs. Then we use the for-in loop, which iterates over the key-value pairs present in the given dictionary and displays them on the output screen in key:value format.

import Foundation
import Glibc

// Create a dictionary
let myDict = ["i": 234, "ii": 782, "iii": 786, "ix":8, "x": 19]

// Printing key-value pairs using for-in loop
for(mKey, mValue) in myDict {
   print("\(mKey) -> \(mValue)")
}

Output

i -> 234
ix -> 8
ii -> 782
iii -> 786
x -> 19

Method 2: Using Properties

To print keys and values of the given dictionary Swift provides the following in-built properties ?

• keys ? This property returns a collection which contains only keys.

Syntax

for x in Dict.keys {
   // statements
}

Here Dict is the dictionary from which we are going to take keys.

• values ? This property returns a collection which contains only values.

Syntax

for x in Dict.values {
   // statements
}

Here Dict is the dictionary from which we are going to take values.

Example

In the following Swift program, we will print the keys and values of a dictionary. So, first, we create a dictionary with key-value pairs. Then we use the for-in loop along with the keys property to iterate over the keys of the dictionary and display all the keys present in the given dictionary. Then we again use the for-in loop with value property to iterate over the values of the dictionary and display all the values present in the given dictionary.

import Foundation
import Glibc

// Create a dictionary
let myDict = ["i": 234, "ii": 782, "iii": 786, "ix":8, "x": 19]

// Printing keys 
print("Keys:")
for m in myDict.keys {
   print("\(m)")
}

// Printing values
print("\nValues:")
for n in myDict.values {
   print("\(n)")
}

Output

Keys:
ii
i
ix
x
iii

Values:
782
234
8
19
786

Conclusion

So this is how we can create and print the keys and values of a dictionary. Both methods print keys and values of the given dictionary. If you want to print keys and values separately you can use keys and values properties whereas if you want to display both key and value pairs together, then you can use a for-in loop. Also, note that the order of the keys and values or key-value pairs may not be the same as given in the dictionary because dictionaries are unordered collections.