How to programmatically check if Variable Type is String in Swift?

Swift – Check if Variable/Object is String

To check if a variable or object is a String, use is operator as shown in the following expression.

x is String

where x is a variable/object.

The above expression returns a boolean value: true if the variable is a String, or false if not a String.

Example

In the following program we will initialise a String variable, and programmatically check if that variable is a String or not using is Operator.

main.swift

var x = "Hello World"
let result = x is String
print("Is the variable a String? \(result)")

Output

Now, let us take a variable x of type Int, and check if x is String or not using is Operator.

main.swift

var x = 25
let result = x is String
print("Is the variable a String? \(result)")

Output

We may use this expression as a condition in if statement.

main.swift

var x = 25
if x is String {
    print("The variable is a String.")
} else {
    print("The variable is not a String.")
}

Output

Conclusion

In this Swift Tutorial, we learned how to check if a variable or object is of type String or not using is Operator.