CODEWITHSUNDEEP
swiftfor-loopdictionarycompare
user3175707
user3175707

Reputation: 1133

how to loop through dictionary keys and compare to my Integer in swift

I have a quick question about how to loop through a dictionary key and compare its key to my integer, then print out the corresponding value if the key exists.

For example, this is my code 

for(var j = 0; j <= someDictionary.count; j++) {
    if ( someInteger == someDictionary.keys[j] ) {
        someDictioanrysValue = someDictionary.values[j]
        println(someDictioanrysValue)
    }
}

is there a method in dictionary that does what I want already?

Upvotes: 0

Views: 596

Answers (1)

ABakerSmith
ABakerSmith

Reputation: 22969

If I understand what you're trying to do correctly, you're just looking to use the subscript - no for loops required.

let dict = [1: "A", 3: "B", 5: "C"]
let myInt = 3

if let value = dict[myInt] {
    print(value)
}

// Prints: B

If a value doesn't exist for the key you supplied, nil will be returned and so the code inside the if let won't be executed.

If you're unfamiliar with this I'd really recommend you take a look at The Swift Programming Language.

Upvotes: 1

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