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Feb 17, 2015
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Book - short explanation of arity #22368

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3 changes: 2 additions & 1 deletion src/doc/trpl/compound-data-types.md
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Expand Up @@ -47,7 +47,8 @@ This pattern is very powerful, and we'll see it repeated more later.

There are also a few things you can do with a tuple as a whole, without
destructuring. You can assign one tuple into another, if they have the same
arity and contained types.
contained types and arity. Tuples have the same arity when they have the same
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@Manishearth Manishearth Feb 16, 2015

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Why introduce the concept of "arity" here at all? "length" should be good enough, and I've never seen the word "arity" being used in this context in discussions about Rust.

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@thiagooak thiagooak Feb 16, 2015

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On #21568 there is a big discussion on this topic.

As for this commit, I think it is kind of a middle ground. And a concrete improvement.

But I guess length would also work

length.

```rust
let mut x = (1, 2); // x: (i32, i32)
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