pattern-match/match-iflet #177
giscus[bot]
bot
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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2022.11.15 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 |
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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 ));
}
}
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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: |
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lala~ |
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感觉rust中的 |
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个人感觉应该是按照 |
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确实，是我之前理解有问题，应该是按照 |
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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 ✅ |
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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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pattern-match/match-iflet
Learning Rust By Practice, narrowing the gap between beginner and skilled-dev with challenging examples, exercises and projects.
https://zh.practice.rs/pattern-match/match-iflet.html
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