metrum 1.1.0

Easily work with and compare temeratures in different units
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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175

pub mod add;
pub mod cmp;
pub mod div;
pub mod mul;
pub mod sub;

#[cfg(feature = "wasm")]
use wasm_bindgen::prelude::*;

#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Copy)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[cfg_attr(feature = "wasm", wasm_bindgen)]
pub struct Weight {
    nanograms: f64, // Using nanograms as base unit for maximum precision
}

#[cfg_attr(feature = "wasm", wasm_bindgen)]
impl Weight {
    pub fn from_kg(val: f64) -> Self {
        Self {
            nanograms: val * 1_000_000_000_000.0,
        }
    }

    pub fn from_g(val: f64) -> Self {
        Self {
            nanograms: val * 1_000_000_000.0,
        }
    }

    pub fn from_mg(val: f64) -> Self {
        Self {
            nanograms: val * 1_000_000.0,
        }
    }

    pub fn from_mcg(val: f64) -> Self {
        Self {
            nanograms: val * 1_000.0,
        }
    }

    pub fn from_ng(val: f64) -> Self {
        Self { nanograms: val }
    }

    pub fn from_lbs(val: f64) -> Self {
        Self {
            nanograms: (val * 453592370000. * 1_000.).round() / 1_000.,
        }
    }

    pub fn as_kg(&self) -> f64 {
        self.nanograms / 1_000_000_000_000.0
    }

    pub fn as_g(&self) -> f64 {
        self.nanograms / 1_000_000_000.0
    }

    pub fn as_mg(&self) -> f64 {
        self.nanograms / 1_000_000.0
    }

    pub fn as_mcg(&self) -> f64 {
        self.nanograms / 1_000.0
    }

    pub fn as_ng(&self) -> f64 {
        self.nanograms
    }

    pub fn as_lbs(&self) -> f64 {
        self.nanograms / 453592370000.
    }
}

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

    #[derive(Debug, Serialize, Deserialize)]
    struct Conversion {
        kg: f64,  // kilograms
        g: f64,   // grams
        mg: f64,  // milligrams
        mcg: f64, // micrograms
        ng: f64,  // nanograms
        lbs: f64, // pounds
    }

    #[test]
    fn should_convert_correctly() {
        let weights = vec![
            Conversion {
                kg: 1.0,
                g: 1000.0,
                mg: 1_000_000.0,
                mcg: 1_000_000_000.0,
                ng: 1_000_000_000_000.0,
                lbs: 2.2046226218487757, // 1 kg in lbs
            },
            Conversion {
                kg: 2.0,
                g: 2000.0,
                mg: 2_000_000.0,
                mcg: 2_000_000_000.0,
                ng: 2_000_000_000_000.0,
                lbs: 4.409245243697551, // 2 kg in lbs
            },
            Conversion {
                kg: 0.5,
                g: 500.0,
                mg: 500_000.0,
                mcg: 500_000_000.0,
                ng: 500_000_000_000.0,
                lbs: 1.1023113109243878, // 0.5 kg in lbs
            },
        ];

        for weight in weights {
            let kg_source = Weight::from_kg(weight.kg);
            let g_source = Weight::from_g(weight.g);
            let mg_source = Weight::from_mg(weight.mg);
            let mcg_source = Weight::from_mcg(weight.mcg);
            let ng_source = Weight::from_ng(weight.ng);
            let lbs_source = Weight::from_lbs(weight.lbs);

            // Convert to kilograms
            assert_eq!(g_source.as_kg(), weight.kg);
            assert_eq!(mg_source.as_kg(), weight.kg);
            assert_eq!(mcg_source.as_kg(), weight.kg);
            assert_eq!(ng_source.as_kg(), weight.kg);
            assert_eq!(lbs_source.as_kg(), weight.kg);

            // Convert to grams
            assert_eq!(kg_source.as_g(), weight.g);
            assert_eq!(mg_source.as_g(), weight.g);
            assert_eq!(mcg_source.as_g(), weight.g);
            assert_eq!(ng_source.as_g(), weight.g);
            assert_eq!(lbs_source.as_g(), weight.g);

            // Convert to milligrams
            assert_eq!(kg_source.as_mg(), weight.mg);
            assert_eq!(g_source.as_mg(), weight.mg);
            assert_eq!(mcg_source.as_mg(), weight.mg);
            assert_eq!(ng_source.as_mg(), weight.mg);
            assert_eq!(lbs_source.as_mg(), weight.mg);

            // Convert to micrograms
            assert_eq!(kg_source.as_mcg(), weight.mcg);
            assert_eq!(g_source.as_mcg(), weight.mcg);
            assert_eq!(mg_source.as_mcg(), weight.mcg);
            assert_eq!(ng_source.as_mcg(), weight.mcg);
            assert_eq!(lbs_source.as_mcg(), weight.mcg);

            // Convert to nanograms
            assert_eq!(kg_source.as_ng(), weight.ng);
            assert_eq!(g_source.as_ng(), weight.ng);
            assert_eq!(mg_source.as_ng(), weight.ng);
            assert_eq!(mcg_source.as_ng(), weight.ng);
            assert_eq!(lbs_source.as_ng(), weight.ng);

            // Convert to pounds
            assert_eq!(kg_source.as_lbs(), weight.lbs);
            assert_eq!(g_source.as_lbs(), weight.lbs);
            assert_eq!(mg_source.as_lbs(), weight.lbs);
            assert_eq!(mcg_source.as_lbs(), weight.lbs);
            assert_eq!(ng_source.as_lbs(), weight.lbs);
        }
    }
}