Swift .removeValue()

The .removeValue() method will remove a key-value pairing from a dictionary based on a given key. If the key exists in the dictionary, the method will return the removed value. However, if the key is not found, the method will return nil.

Syntax

dictionaryInstance.removeValue(forKey: key)

The dictionaryInstance is the dictionary in which the key-value pairing will be removed. The key parameter is the key to remove.

Example

In the example below, the fruitBasket dictionary is checked to see if the key Apples exists. If it does, it will remove that key and print the corresponding value. If it doesn’t, a value of nil is returned.

var fruitBasket = [
    "Apples":3,
    "Bananas":7,
    "Oranges":2,
    "Pineapples":4,
]

if let removedValue = fruitBasket.removeValue(forKey: "Apples") {
    print(removedValue) // Output: 3

} else {
    print("The key 'Apples' does not exist in the dictionary.")
}

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