Tracking Issue for #138068: Add `Result::map_or_default` and `Option::map_or_default`

[fpervaiz]

Feature gate: #![feature("result_option_map_or_default")]

This is a tracking issue for adding Result::map_or_default() and Option::map_or_default(). Open RFC rust-lang/rfcs#3148

Public API

// core::result

impl<T, E> Result<T, E> {
    pub fn map_or_default<U, F>(self, f: F) -> U
    where
        U: Default,
        F: FnOnce(T) -> U { .. }
}

// core::option

impl<T> Option<T> {
    pub fn map_or_default<U, F>(self, f: F) -> U
    where
        U: Default,
        F: FnOnce(T) -> U { .. }
}

Steps / History

• Implementation: Add Result::map_or_default and Option::map_or_default #141659
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• None yet.

Footnotes

1. https://std-dev-guide.rust-lang.org/feature-lifecycle/stabilization.html ↩

[tkr-sh]

@fpervaiz The FCP is not done, and we will need multiple months before so