Using Err(()).unwrap_or_else(|| { /* closure */}) to initialize a variable

Question

Using Err(()).unwrap_or_else(|| { /* closure */}) to initialize a variable

using a closure, example:
// Alternate vectors' items
let x = vec![1, 3, 5, 7, 9];
let y = vec![2, 4, 6, 8, 10];

let z: Vec<i32> = Err(()).unwrap_or_else(|()| {

// Result
let mut new_vec: Vec<i32> = vec![];

// Note: range may vary depending on both vectors' size, this is an example
for i in 0..5 {
new_vec.push(x[i]);
new_vec.push(y[i]);
}

new_vec
});

println!("x: {:?}\ny: {:?}\nz: {:?}", x, y, z);
Genius or noob?

0

18.06.2019

2 ответов

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swarnim

I really feel like it was you trolling TBH.

0

18.06.2019

Artem Starikov · Accepted Answer

Artem Starikov

you could also type let z = { .. }; since rust is expression-based

0

18.06.2019

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Using Err(()).unwrap_or_else(|| { /* closure */}) to initialize a variable

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