0x00 Lesson
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 typin string
. to bring up Xcode’s code completion options.
0x01 我的小作品
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