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from_fn

 2 years ago
source link: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html
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pub fn from_fn<T, const N: usize, F>(cb: F) -> [T; N] where
    F: FnMut(usize) -> T, 

Creates an array [T; N] where each array element T is returned by the cb call.

Arguments

  • cb: Callback where the passed argument is the current array index.

Example

let array = core::array::from_fn(|i| i);
assert_eq!(array, [0, 1, 2, 3, 4]);
Run

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