E0599 rust type_error ai_generated true

error[E0599]: no method named `find` found for struct `HashMap<String, i32>` in the current scope

ID: rust/e0599-no-method-named-find-for-struct-hashmap

Also available as: JSON · Markdown · 中文
90%Fix Rate
88%Confidence
1Evidence
2023-07-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
rustc 1.68.0 active — — —
rustc 1.72.0 active — — —
rustc 1.78.0 active — — —

Root Cause

Calling a method that doesn't exist on the type, often due to confusing the method name with another type (e.g., using `find` from iterators on a HashMap directly).

generic

中文

调用了该类型不存在的方法，通常是由于将方法名与另一种类型混淆（例如，在HashMap上直接使用迭代器的`find`方法）。

Official Documentation

https://doc.rust-lang.org/error_codes/E0599.html

Workarounds

  1. 95% success Call `.iter()` on the HashMap to get an iterator, then use `.find()` on the iterator. 
    Call `.iter()` on the HashMap to get an iterator, then use `.find()` on the iterator.
  2. 90% success Use `HashMap::get` or `HashMap::contains_key` for key-based lookups instead of `find`. 
    Use `HashMap::get` or `HashMap::contains_key` for key-based lookups instead of `find`.

中文步骤

  1. 在HashMap上调用`.iter()`获取迭代器，然后在迭代器上使用`.find()`。
  2. 使用`HashMap::get`或`HashMap::contains_key`进行基于键的查找，而不是使用`find`。

Dead Ends

Common approaches that don't work:

  1. 90% fail

    HashMap itself doesn't implement Iterator; you need to call `.iter()` first.

  2. 80% fail

    Dereferencing a HashMap doesn't give you an iterator; it gives you the inner type, which also doesn't have `find`.

  3. 95% fail

    HashMap does not have a static `find` method; it's an iterator method.