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Factorial exercise #15

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carloslbello opened this issue Sep 24, 2015 · 1 comment
Closed

Factorial exercise #15

carloslbello opened this issue Sep 24, 2015 · 1 comment

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@carloslbello
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I think a factorial exercise would help people learn about Ranges and .fold(). As an example solution:

fn factorial(num: u64) -> u64 {
    (1..num + 1).fold(1, |prod, x| prod * x)
}
@mwilli20 mwilli20 mentioned this issue Jan 6, 2017
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@carols10cents
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Closed by #56!! 🎉

cedrickchee pushed a commit to cedrickchee/rustlings-solutions that referenced this issue Nov 15, 2019
@mwilli20
Create iterators4.rs
98c0968 
Tackles rust-lang/rustlings#15 . I think this allows for varying levels of difficulty depending on a users background. But ideally people can move there way up from 1, 2, 3 (Numbers below).

1. 
    let mut result = 1;
    for i in 1..x + 1 {
        result *= i;
    }
    result

2. 
    match x {
        0 | 1 => 1,
        x => x * factorial(x - 1),
    }
3. 
    (1..x + 1).product()
ppp3 pushed a commit to ppp3/rustlings that referenced this issue May 23, 2022
Create iterators4.rs
ed9f0fc 
Tackles rust-lang#15 . I think this allows for varying levels of difficulty depending on a users background. But ideally people can move there way up from 1, 2, 3 (Numbers below).

1. 
    let mut result = 1;
    for i in 1..x + 1 {
        result *= i;
    }
    result

2. 
    match x {
        0 | 1 => 1,
        x => x * factorial(x - 1),
    }
3. 
    (1..x + 1).product()
FancyGeekGuru added a commit to FancyGeekGuru/rust-lings that referenced this issue May 24, 2022
@FancyGeekGuru
Create iterators4.rs
c6c9f62 
Tackles rust-lang/rustlings#15 . I think this allows for varying levels of difficulty depending on a users background. But ideally people can move there way up from 1, 2, 3 (Numbers below).

1. 
    let mut result = 1;
    for i in 1..x + 1 {
        result *= i;
    }
    result

2. 
    match x {
        0 | 1 => 1,
        x => x * factorial(x - 1),
    }
3. 
    (1..x + 1).product()
beephsupreme added a commit to beephsupreme/rustlings that referenced this issue Jul 25, 2023
@beephsupreme
complete through rust-lang#15
4b9d635
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@carols10cents @carloslbello