是否有等效于JavaScript的Rust数组的indexOf？ [英] Is there an equivalent of JavaScript's indexOf for Rust arrays?

问题描述

var fruits = ["Banana", "Orange", "Apple", "Mango"];
var index = fruits.indexOf("Apple");

let fruits = ["Banana", "Orange", "Apple", "Mango"];
let index = fruits.???

如果没有等效项，也许您可​​以指出正确的方向？我发现了这个示例，但是它是用于向量的，而不是用于数组的。

If there is no equivalent, maybe you can point me in the right direction? I found this example, but it's for vectors, not arrays.

推荐答案

您可以使用方法 position 在任何迭代器上。您可以使用 iter（） 方法。像这样尝试：

You can use the method position on any iterator. You can get an iterator over an array with the iter() method. Try it like this:

let fruits = ["Banana", "Orange", "Apple", "Mango"];
let res1 = fruits.iter().position(|&s| s == "Apple");
let res2 = fruits.iter().position(|&s| s == "Peter");

println!("{:?}", res1);    // outputs: Some(2)
println!("{:?}", res2);    // outputs: None

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