Rust: What is the difference between Into and From?

From — convert into type. Into — convert from type.

From:

• Implement for target type.
• Preferred.
• Auto-derives Into.

Into:

• Implement for source type.
• Less common.
• Useful when From not possible.

1// Implement From
2impl From<&str> for MyString {
3    fn from(s: &str) -> Self {
4        MyString(s.to_string())
5    }
6}
7
8// Use Into
9let s: MyString = "hello".into();
10let s: MyString = MyString::from("hello");

Key: Implement From, use Into.