Macro map

macro_rules! map {
    ( $(( $k:expr, $v:expr )),* $(,)?) => { ... };
    ( $( $k:expr => $v:expr ),* $(,)?) => { ... };
}

Expand description

Create a new map collection and insert key-value pairs.

Example with tuple syntax:

let m = map!((1, 2), (3, 4));

Example with arrow syntax:

let m = map!(1 => 2, 3 => 4);

Example with multiple lines and tuple syntax:

let m = map!(
    (1, 2),
    (3, 4),
);

Example with multiple lines and arrow syntax:

let m = map!(
    1 => 2,
    3 => 4,
);

Equivalent Rust standard code:

let mut m = HashMap::new();
m.insert(1, 2);
m.insert(3, 4);

map