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Showing content from https://github.com/rust-lang/rust/issues/138099 below:

map_or_default` · Issue #138099 · rust-lang/rust · GitHub

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

// 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 { .. }
}

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

• None yet.

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

nik-rev, regar42, tkr-sh and LinusU

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