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pattern-match/match-iflet #177
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pattern-match/match-iflet
Learning Rust By Practice, narrowing the gap between beginner and skilled-dev with challenging examples, exercises and projects.
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👍 18 -
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🚀 6
Replies: 55 comments 9 replies
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done
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done
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"你可以在这里找到答案(在 solutions 路径下)",这句话的超链接指向有问题
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done
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Done.
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done
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Done.
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2022年11月15日 Done.
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down
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练习6中为啥我这样写 会报错 error[E0425]: cannot find value i in this scope
fn main() {
let o = Some(7);
if let o = Some(i) {
println!("This is a really long string and `{:?}`", i);
}
}
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單純的語法誤解
if let Some(`新的(解開包裝後的)變數名稱`) = `目標解開包裝的變數` { ...snip } 正確答案在這邊 https://github.com/sunface/rust-by-practice/blob/master/solutions/pattern-match/match.md
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fn main() { let o = Some(7); if let Some(i) = o { println!("This is a really long string and `{:?}`", i); } }
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done
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done
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小白求教,课后题第三题中Message枚举中的Move后面为啥跟的是花括号
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Move后是一个匿名结构体,所以是花括号。
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在第四题中,我遇到一个想不明白的问题。
fn main() { let alphabets = ['a', 'E', 'Z', '0', 'x', '9' , 'Y']; // 使用 `matches` 填空 for ab in alphabets { // 这里为什么会断言通过呢 assert!(matches!(ab , i32 )); } }
matches!(ab , i32 )返回的结果是true,为什么不是false呢?
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这里的i32应该只是作为一个名称而非类型名吧, 就和换成a, b之类的名称一样含义。
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这里还会有个警告 ^^^ help: if this is intentional, prefix it with an underscore: _i32 让你不要用i32作为名称
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lala~
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感觉rust中的字符范围表达式应该是按照ascii码表来看是否连续的
第四题中 matches!(ab, ' '..='~') 也是没问题的
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个人感觉应该是按照 char 以 UTF-8标准 映射出的 bytes 的 范围 来判断
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个人感觉应该是按照
char以UTF-8标准映射出的bytes的范围来判断
确实,是我之前理解有问题,应该是按照char的对应unicode编码来进行范围判断的,教程里面已经明确说了char是按unicode编码的,只是很多unicode字符平常实际不怎么用就是了😂
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终于在这章领悟到变量解构了
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done
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done
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Done!
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感觉这节相对简单点
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完成
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done
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done
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Done ✅
Day 7
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done
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第5题好像还能这样写
enum MyEnum { Foo, Bar } fn main() { let mut count = 0; let v = vec![MyEnum::Foo,MyEnum::Bar,MyEnum::Foo]; for e in v { if let MyEnum::Foo = e { // 修复错误,只能修改本行代码 count += 1; } } assert_eq!(count, 2); }
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done
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Done
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done
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done
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