Dictionary Length in Swift

In Swift, you can get the number of key-value pairs in a Dictionary using the .count property:

var scores: [String: Int] = [:]
scores["Alice"] = 95
scores["Bob"] = 87
scores["Charlie"] = 72

let count = scores.count
print(count)  // 3

.count returns the number of entries. You can also check if it's empty with .isEmpty:

print(scores.isEmpty)  // false
var empty: [String: Int] = [:]
print(empty.count)     // 0