let mut strctr = Counter::new(); strctr.count("apple"); strctr.count("orange"); strctr.count("apple"); println!("got {} apples", strctr.times_seen("apple")); } 16.8.1 解決方案 use std::collections::HashMap; let mut strctr = Counter::new(); strctr.count("apple"); strctr.count("orange"); strctr.count("apple"); println!("got {} apples", strctr.times_seen("apple")); } 87 第 17 部分 標準函式庫 This segment should

...) Complex blocks: @static if Sys.islinux() linux_specific_thing(a) elseif Sys.isapple() apple_specific_thing(a) else generic_thing(a) end When nesting conditionals, the @static must be repeated expressed using the macro @enum(name, value1, value2, ...) For example: @enum(Fruit, banana=1, apple, pear)CHAPTER 39. NOTEWORTHY DIFFERENCES FROM OTHER LANGUAGES 534 • By convention, functions that Fruit apple=1 orange=2 kiwi=3 julia> f(x::Fruit) = "I'm a Fruit with value: $(Int(x))" f (generic function with 1 method) julia> f(apple) "I'm a Fruit with value: 1" julia> Fruit(1) apple::Fruit

...) Complex blocks: @static if Sys.islinux() linux_specific_thing(a) elseif Sys.isapple() apple_specific_thing(a) else generic_thing(a) end When nesting conditionals, the @static must be repeated expressed using the macro @enum(name, value1, value2, ...) For example: @enum(Fruit, banana=1, apple, pear) • By convention, functions that modify their arguments have a ! at the end of the name, for Fruit apple=1 orange=2 kiwi=3 julia> f(x::Fruit) = "I'm a Fruit with value: $(Int(x))" f (generic function with 1 method) julia> f(apple) "I'm a Fruit with value: 1" julia> Fruit(1) apple::Fruit

...) Complex blocks: @static if Sys.islinux() linux_specific_thing(a) elseif Sys.isapple() apple_specific_thing(a) else generic_thing(a) end When nesting conditionals, the @static must be repeated expressed using the macro @enum(name, value1, value2, ...) For example: @enum(Fruit, banana=1, apple, pear) • By convention, functions that modify their arguments have a ! at the end of the name, for Fruit apple=1 orange=2 kiwi=3 julia> f(x::Fruit) = "I'm a Fruit with value: $(Int(x))" f (generic function with 1 method) julia> f(apple) "I'm a Fruit with value: 1" julia> Fruit(1) apple::Fruit

...) Complex blocks: @static if Sys.islinux() linux_specific_thing(a) elseif Sys.isapple() apple_specific_thing(a) else generic_thing(a) end When nesting conditionals, the @static must be repeated expressed using the macro @enum(name, value1, value2, ...) For example: @enum(Fruit, banana=1, apple, pear)CHAPTER 39. NOTEWORTHY DIFFERENCES FROM OTHER LANGUAGES 535 • By convention, functions that Fruit apple=1 orange=2 kiwi=3 julia> f(x::Fruit) = "I'm a Fruit with value: $(Int(x))" f (generic function with 1 method) julia> f(apple) "I'm a Fruit with value: 1" julia> Fruit(1) apple::Fruit

...) Complex blocks: @static if Sys.islinux() linux_specific_thing(a) elseif Sys.isapple() apple_specific_thing(a) else generic_thing(a) end When nesting conditionals, the @static must be repeated expressed using the macro @enum(name, value1, value2, ...) For example: @enum(Fruit, banana=1, apple, pear)CHAPTER 39. NOTEWORTHY DIFFERENCES FROM OTHER LANGUAGES 534 • By convention, functions that Fruit apple=1 orange=2 kiwi=3 julia> f(x::Fruit) = "I'm a Fruit with value: $(Int(x))" f (generic function with 1 method) julia> f(apple) "I'm a Fruit with value: 1" julia> Fruit(1) apple::Fruit

...) Complex blocks: @static if Sys.islinux() linux_specific_thing(a) elseif Sys.isapple() apple_specific_thing(a) else generic_thing(a) end When nesting conditionals, the @static must be repeated expressed using the macro @enum(name, value1, value2, ...) For example: @enum(Fruit, banana=1, apple, pear)CHAPTER 39. NOTEWORTHY DIFFERENCES FROM OTHER LANGUAGES 534 • By convention, functions that Fruit apple=1 orange=2 kiwi=3 julia> f(x::Fruit) = "I'm a Fruit with value: $(Int(x))" f (generic function with 1 method) julia> f(apple) "I'm a Fruit with value: 1" julia> Fruit(1) apple::Fruit

...) Complex blocks: @static if Sys.islinux() linux_specific_thing(a) elseif Sys.isapple() apple_specific_thing(a) else generic_thing(a) end When nesting conditionals, the @static must be repeated expressed using the macro @enum(name, value1, value2, ...) For example: @enum(Fruit, banana=1, apple, pear)CHAPTER 39. NOTEWORTHY DIFFERENCES FROM OTHER LANGUAGES 534 • By convention, functions that Fruit apple=1 orange=2 kiwi=3 julia> f(x::Fruit) = "I'm a Fruit with value: $(Int(x))" f (generic function with 1 method) julia> f(apple) "I'm a Fruit with value: 1" julia> Fruit(1) apple::Fruit

...) Complex blocks: @static if Sys.islinux() linux_specific_thing(a) elseif Sys.isapple() apple_specific_thing(a) else generic_thing(a) end When nesting conditionals, the @static must be repeated expressed using the macro @enum(name, value1, value2, ...) For example: @enum(Fruit, banana=1, apple, pear) • By convention, functions that modify their arguments have a ! at the end of the name, for Fruit apple=1 orange=2 kiwi=3 julia> f(x::Fruit) = "I'm a Fruit with value: $(Int(x))" f (generic function with 1 method) julia> f(apple) "I'm a Fruit with value: 1" julia> Fruit(1) apple::Fruit

...) Complex blocks: @static if Sys.islinux() linux_specific_thing(a) elseif Sys.isapple() apple_specific_thing(a) else generic_thing(a) end When nesting conditionals, the @static must be repeated expressed using the macro @enum(name, value1, value2, ...) For example: @enum(Fruit, banana=1, apple, pear) • By convention, functions that modify their arguments have a ! at the end of the name, for Fruit apple=1 orange=2 kiwi=3 julia> f(x::Fruit) = "I'm a Fruit with value: $(Int(x))" f (generic function with 1 method) julia> f(apple) "I'm a Fruit with value: 1" julia> Fruit(1) apple::Fruit