sheeet-funcs 0.1.4

Sheeet! base functions crate.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130

use wasm_bindgen::prelude::*;

pub mod prelude {
    pub use crate::add;
    pub use crate::avg;
    pub use crate::concat_with;
    pub use crate::div;
    pub use crate::med;
    pub use crate::mul;
    pub use crate::sub;
    pub use crate::sum;

    #[cfg(feature = "fetch")]
    pub use crate::fetch::fetch_get_json_path;
}

#[cfg(feature = "fetch")]
mod fetch;

#[wasm_bindgen]
pub fn add(a: f32, b: f32) -> f32 {
    a + b
}

#[wasm_bindgen]
pub fn sub(a: f32, b: f32) -> f32 {
    a - b
}

#[wasm_bindgen]
pub fn div(a: f32, b: f32) -> f32 {
    a / b
}

#[wasm_bindgen]
pub fn mul(a: f32, b: f32) -> f32 {
    a * b
}

#[wasm_bindgen]
pub fn pow(a: f32, n: f32) -> f32 {
    a.powf(n)
}

#[wasm_bindgen]
pub fn sum(vec: Vec<f32>) -> f32 {
    vec.into_iter().sum()
}

#[wasm_bindgen]
pub fn avg(vec: Vec<f32>) -> f32 {
    if vec.len() == 0 {
        return 0.0;
    }
    let len = vec.len() as f32;
    vec.into_iter().sum::<f32>() / len
}

/// Discrete implementation of median.
#[wasm_bindgen]
pub fn med(vec: Vec<f32>) -> f32 {
    if vec.len() == 0 {
        return 0.0;
    }
    vec.get(vec.len() / 2)
        .expect("expected median position to exist in the vector")
        .clone()
}

#[wasm_bindgen]
pub fn concat_with(vec: Vec<String>, sep: &str) -> String {
    let mut str = String::new();
    let len = vec.len();
    for (i, s) in vec.into_iter().enumerate() {
        str.push_str(&s);
        if i < len - 1 {
            str.push_str(sep);
        }
    }
    str
}

#[cfg(test)]
mod tests {
    use crate::*;

    #[test]
    fn test_avg() {
        assert_eq!(avg(vec![]), 0.0);
        assert_eq!(avg(vec![1.0, 2.0, 3.0]), 2.0);
        assert_eq!(avg(vec![1.0, 1.0, 7.0]), 3.0);
    }

    #[test]
    fn test_med() {
        assert_eq!(med(vec![]), 0.0);
        assert_eq!(med(vec![1.0, 2.0, 3.0, 4.0, 5.0]), 3.0);
        assert_eq!(med(vec![1.0, 1.0, 2.0, 2.0, 2.0]), 2.0);
        assert_eq!(med(vec![1.0, 2.0, 3.0, 4.0, 5.0, 6.0]), 4.0); // Discrete implementation.
    }

    #[test]
    fn test_concat_with() {
        assert_eq!(
            concat_with(
                vec![
                    "I".into(),
                    "want".into(),
                    "to".into(),
                    "join".into(),
                    "some".into(),
                    "text.".into()
                ],
                " "
            ),
            "I want to join some text."
        );
        assert_eq!(
            concat_with(vec!["w".into(), "o".into(), "r".into(), "d".into(),], ""),
            "word"
        );
        assert_eq!(
            concat_with(
                vec!["a".into(), "list".into(), "of".into(), "items".into(),],
                ", "
            ),
            "a, list, of, items"
        );
    }
}