The removeValue() method removes the certain key and its associated value from the dictionary.
Example
// create a dictionary with two elements
var information = ["Charlie": 54, "Harvey": 34]
// remove certain key-value pair using removeValue()
information.removeValue(forKey: "Charlie")
// print updated dictionary
print(information)
// Output: ["Harvey": 34]
removeValue() Syntax
The syntax of the removeValue() method is:
dictionary.removeValue(forKey: key)
Here, dictionary is an object of the Dictionary class.
removeValue() Parameters
The removeValue() method takes one parameter:
key- The key to remove along with its associated value.
removeValue() Return Value
- The
removeValue()method returns the removed value from dictionary.
Example: Swift removeValue()
// create a dictionary with three elements
var numbers = ["one": 1, "Two": 2, "Three": 3]
print("Before:", numbers)
// remove "Three" and it's associated value 3
numbers.removeValue(forKey: "Three")
// print updated dictionary
print("After:", numbers)
Output
Before: ["Two": 2, "one": 1, "Three": 3] After: ["Two": 2, "one": 1]
In the above example, we have created a dictionary named numbers with three key-value pairs.
Here, we have used the removeValue() method to remove the key named "Three" and its associated value 3.