Swift – Check if String Starts with Another String

To check if a String str1 starts with another String str2 in Swift, use String.starts() function. Call starts() function on str1 and pass str2 as argument.

The syntax to check if String str1 starts with the String str2 is

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str1.starts(with: str2)

starts() function returns a boolean value. If string str1 starts with the string str2 , then the function returns true, else the function returns false.

Example

In this example, we will take two string in variables str1 and str2. Using String.starts() function, we will check if the string str1 starts with the string str2.

main.swift

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var str1 = "abcdefgh"
var str2 = "abcd"
var result = str1.starts(with: str2)
print( "Does str1 start with str2? \(result)" )

Output

Does str1 start with str2? true

Now, we will take different values for str1 and str2, such that str1 does not start with str2, and check the result of starts() function.

main.swift

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var str1 = "abcdefgh"
var str2 = "ccd"
var result = str1.starts(with: str2)
print( "Does str1 start with str2? \(result)" )

Output

Does str1 start with str2? false

Conclusion

In this Swift Tutorial, we learned how to check if a string starts with another specific string using String.starts() function.