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Swift Program to Replace Elements in a Dictionary
In Swift, a dictionary is an unordered collection of key-value pairs. So, to replace the value of a key Swift provides bracket notation or subscript notations. Using this notation we can also add new key-value pair in the dictionary if the specified pair does not exist.
Syntax
dict[keyName] = “Value”
Here, dict is the dictionary. The keyName represents the key whose value you want to replace, and the Value represent the new value.
Algorithm
Step 1 − Create a dictionary with key-value pairs.
Step 2 − Display the original dictionary.
Step 3 − Now replace the value of a key with the new value using the subscript notation.
Step 4 − Display the modified value.
Example
In the following Swift program, we are going to replace elements in a dictionary. So for that, we create a dictionary and then using subscript notation we replace the original value of the key: 105 with the new value that is “Puppy”.
import Foundation
import Glibc
var myPet = [102:"Cow", 103:"Dog", 104: "Cat", 105: "Lizard"]
print("Original Pet dictionary: \(myPet)")
myPet[105] = "Puppy"
print("Modified Pet dictionary: \(myPet)")
Output
Original Pet dictionary: [105: "Lizard", 102: "Cow", 104: "Cat", 103: "Dog"] Modified Pet dictionary: [105: "Puppy", 102: "Cow", 104: "Cat", 103: "Dog"]
Conclusion
So this is how we can replace elements in a dictionary. Using bracket notation we can replace only one value at a time with the new value. Also, note that the order of the key-value pairs may vary because the dictionary is an unordered collection.
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