Update 'let is used to introduce variables' paragraph #24149
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r? @pcwalton (rust_highfive has picked a reviewer for you, use r? to override) |
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Thanks for @jorisgio reminding me that the binding of But consider this: fn main() {
let (x, (y,));
x = 10;
y = true;
}playpen I still suggest there's no "variable definition" in Rust. |
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In my opinion, in |
| We don't use the term variable, instead we use bindings. | ||
| The simplest way for binding is the `let` syntax, other ways including | ||
| `if let`, `while let` and `match`. Bindings also exist in function arguments | ||
| positions. |
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there should be a newline after this, to make a new paragraph. also, the wrapping seems a bit odd.
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The official term is 'variable bindings', though sometimes, people just say one or the other. |
| `mut` annotations. An interesting historical note is that Rust comes, | ||
| syntactically, most closely from ML, which also uses `let` to introduce | ||
| bindings. | ||
| ## How to introduce variables? |
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I would prefer to change this to "Why is let used to introduce variables?"
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I do think this needs improvement and this is overall an improvement, just some nits :) |
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Thanks :) |
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@bors: r+ rollup |
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📌 Commit c9454b1 has been approved by |
I think "let is used to introduce variables" is incorrent.
You can use
```rust
match (42, true) {
(x, y) => { /* ... */ }
}
```
to replace
```rust
let x = 42;
let y = true;
```
so it's nothing special for `let`.
| bindings. | ||
| We don't use the term "variable", instead, we use "variable bindings". The | ||
| simplest way for binding is the `let` syntax, other ways including `if let`, | ||
| `while let` and `match`. Bindings also exist in function arguments positions. |
There was a problem hiding this comment.
I missed a case here: for-in also do pattern matching.
I'll try update it.
I think "let is used to introduce variables" is incorrent.
You can use
to replace
so it's nothing special for
let.