Swift notes string

string

Introduction to the

Strings in String are value types that are copied when passed, while strings in NSString are references. We can traverse the string with for in:

var a : String = "a"

for c in "Hello" {

    println(c)

}

You can count the number of characters in a string by countElements:

countElements("1234567") // 7

Note, however, that countElements and NSString's length are not always exactly the same value, because length makes use of UTF-16 instead of Unicode characters. For example, when the emoji expression is added, UTF-16 calculates 2, while Unicode calculates 1. Here's an example:

var a = "Hello

That's all for this article, I hope you enjoy it.