Properties and methods of strings
We’ve used lots of strings so far, and it turns out they are structs – they have their own methods and properties we can use to query and manipulate the string.
First, let’s create a test string:
let string = "Do or do not, there is no try."You can read the number of characters in a string using its count property:
print(string.count)They have a hasPrefix() method that returns true if the string starts with specific letters:
print(string.hasPrefix("Do"))You can uppercase a string by calling its uppercased() method:
print(string.uppercased())And you can even have Swift sort the letters of the string into an array:
print(string.sorted())Strings have lots more properties and methods – try typing string. to bring up Xcode’s code completion options.
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