Swif creating string and string comparisons

Strings are concatenated with multiple strings.

There are 2 types of swift strings: string and NSString

The type of string is just string, in fact string is a struct

You can assign values directly, or you can create them through the constructor of the struct

Let Emptystring=string ()

By using let and VAR declaration variables for strings to implement immutable strings and mutable strings, the Let-declared string is immutable, VAR is variable

Comparison of strings:

1, size comparison;>,<

2. Equal comparison

Unlike comparison sizes, String and character types use = = and = comparisons, but cannot use the = = and!== operators

NSString can use = = = and!==

3, prefix and suffix comparison

(1) The string Hassuffix () method to determine the suffix;

Doc.hassuffix (". docx");

Doc is a string type

(2) Hasprefix of Strings ("Java")

Lowercasedoc.hasprefix ("Java")

Lowercasedoc is a String type

This article is from the "Ordinary Road" blog, please be sure to keep this source http://linjohn.blog.51cto.com/1026193/1619428

Swif creating string and string comparisons