Swift 2.0 Learning Note (Day5)-Identifiers and keywords I know

Swift 2.0 Study notes (Day5 )--The identifiers and keywords I know

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a lot of computer language has identifiers and keywords, has not been a good summary, is such a use, now a small tidy up the Identifiers and keywords in Swift.

What is an identifier?

identifiers is the name specified by the developer for variables, constants, methods, functions, enumerations, structs, classes, protocols, and so on.

swift

• case-sensitive, myname and myname is a two different identifier;

• _) or a letter, but not a number;

• The other characters in the identifier can be underscores (_), letters, or numbers.

For example:UserName,User_name,_sys_val, height, etc. as a valid identifier, and2mail,room#and theClassis an illegal identifier.

What is keyword > What about it?

" ) to enclose it.

swift language common keywords have the following 4 > species.

• keywords related to declaration: class, deinit, enum ET.

• keywords related to statements: Break, case, continue ET.

• expression and type keywords: as, catch, dynamictype, false ET.

• keywords used in a specific context:associativity,Convenience,Dynamicand so on.

SwiftThe keywords are case-sensitive, soClassand theClassis different, thenClassis notSwiftthe key word.

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Swift 2.0 Learning Note (Day5)-Identifiers and keywords I know