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To implement `indexOf` in Rust, we can use the `find` method provided by Rust’s `str` type. The `find` method returns an `Option
Here’s an example implementation of `indexOf` in Rust:
fn index_of(haystack: &str, needle: &str) -> Option
In this example, we define a function called `index_of` which takes two arguments: `haystack` and `needle`. `haystack` is the string we want to search within, and `needle` is the substring we want to find the index of.
We then call the `find` method on `haystack` with `needle` as an argument. This returns an `Option
Using this implementation, we can easily find the index of a substring within a string in Rust.
Overall, implementing `indexOf` in Rust is a simple task thanks to Rust’s powerful string manipulation methods.