Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 7.3 Unicode and UTF-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 7.4 Concatenation . . . promotions for numeric and other types • Efficient support for Unicode, including but not limited to UTF-8 • Call C functions directly (no wrappers or special APIs needed) • Powerful shell-like capabilities julia> UniversalDeclarationOfHumanRightsStart = "" "" 7CHAPTER 3. VARIABLES 8 Unicode names (in UTF-8 encoding) are allowed: julia> δ = 0.00001 1.0e-5 julia> = "Hello" "Hello" In the Julia REPL and

Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 7.3 Unicode and UTF-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 7.4 Concatenation . . . promotions for numeric and other types • Efficient support for Unicode, including but not limited to UTF-8 • Call C functions directly (no wrappers or special APIs needed) • Powerful shell-like capabilities julia> UniversalDeclarationOfHumanRightsStart = "" "" 7CHAPTER 3. VARIABLES 8 Unicode names (in UTF-8 encoding) are allowed: julia> δ = 0.00001 1.0e-5 julia> = "Hello" "Hello" In the Julia REPL and

has been percent-decoded and is now a byte string. By default, this method decodes the argument as utf-8 and returns a unicode string, but this may be overridden in subclasses. This method is used as a None, plus: bool = True) → bytes tornado.escape.url_unescape(value: str | bytes, encoding: str = 'utf-8', plus: bool = True) → str Decodes the given value from a URL. The argument may be either a byte given, the encoding will be detected automatically (among UTF-8 and UTF-16) if the file contains a byte-order marker (BOM), defaulting to UTF-8 if no BOM is present. Example translation es_LA.csv: "I

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 iCONTENTS ii 8.3 Unicode and UTF-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 8.4 Concatenation . . . promotions for numeric and other types • Efficient support for Unicode, including but not limited to UTF-8 • Call C functions directly (no wrappers or special APIs needed) • Powerful shell-like capabilities julia> UniversalDeclarationOfHumanRightsStart = "" "" 10CHAPTER 4. VARIABLES 11 Unicode names (in UTF-8 encoding) are allowed: julia> δ = 0.00001 1.0e-5 julia> = "Hello" "Hello" In the Julia REPL and

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 iCONTENTS ii 8.3 Unicode and UTF-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 8.4 Concatenation . . . promotions for numeric and other types • Efficient support for Unicode, including but not limited to UTF-8 • Call C functions directly (no wrappers or special APIs needed) • Powerful shell-like capabilities julia> UniversalDeclarationOfHumanRightsStart = "" "" 10CHAPTER 4. VARIABLES 11 Unicode names (in UTF-8 encoding) are allowed: julia> δ = 0.00001 1.0e-5 julia> = "Hello" "Hello" In the Julia REPL and

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 iCONTENTS ii 8.3 Unicode and UTF-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 8.4 Concatenation . . . promotions for numeric and other types • Efficient support for Unicode, including but not limited to UTF-8 • Call C functions directly (no wrappers or special APIs needed) • Powerful shell-like capabilities julia> UniversalDeclarationOfHumanRightsStart = "" "" 10CHAPTER 4. VARIABLES 11 Unicode names (in UTF-8 encoding) are allowed: julia> δ = 0.00001 1.0e-5 julia> = "Hello" "Hello" In the Julia REPL and

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153 8.2. 使用字符串储存 UTF-8 编码的文本 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 我们现在想将某个值绑定在变量上。等号的右边是 guess 所绑定的值，它是 String::new 的结果，这个函数会返回一个 String 的新实例。String 是一个标准库提供的字 符串类型，它是 UTF-8 编码的可增长文本块。 ::new 那一行的 :: 语法表明 new 是 String 类型的一个 关联函数（associated function）。关 联函数是针对某个类型实现的函数，在这个例子中是 U+E000 到 U+10FFFF 在内的值。 不过，“字符” 并不是一个 Unicode 中的概念，所以人直觉上的 “字符” 可能与 Rust 中的 char 并不符合。第八章的 “使用字符串储存 UTF-8 编码的文本” 中将详细讨论这个主题。 复合类型 复合类型（Compound types）可以将多个值组合成一个类型。Rust 有两个原生的复合类型： 元组（tuple）和数组（array）。

Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 8.3 Unicode and UTF-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 8.4 Concatenation . . . promotions for numeric and other types • Efficient support for Unicode, including but not limited to UTF-8 • Call C functions directly (no wrappers or special APIs needed) • Powerful shell-like capabilities julia> UniversalDeclarationOfHumanRightsStart = "" "" 10CHAPTER 4. VARIABLES 11 Unicode names (in UTF-8 encoding) are allowed: julia> δ = 0.00001 1.0e-5 julia> = "Hello" "Hello" In the Julia REPL and

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 iCONTENTS ii 8.3 Unicode and UTF-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 8.4 Concatenation . . . promotions for numeric and other types • Efficient support for Unicode, including but not limited to UTF-8 • Call C functions directly (no wrappers or special APIs needed) • Powerful shell-like capabilities julia> UniversalDeclarationOfHumanRightsStart = "" "" 10CHAPTER 4. VARIABLES 11 Unicode names (in UTF-8 encoding) are allowed: julia> δ = 0.00001 1.0e-5 julia> = "Hello" "Hello" In the Julia REPL and

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 iCONTENTS ii 8.3 Unicode and UTF-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 8.4 Concatenation . . . promotions for numeric and other types • Efficient support for Unicode, including but not limited to UTF-8 • Call C functions directly (no wrappers or special APIs needed) • Powerful shell-like capabilities julia> UniversalDeclarationOfHumanRightsStart = "" "" 10CHAPTER 4. VARIABLES 11 Unicode names (in UTF-8 encoding) are allowed: julia> δ = 0.00001 1.0e-5 julia> = "Hello" "Hello" In the Julia REPL and