headless_lms_utils/
numbers.rs

1pub fn f32_approx_eq(first: f32, second: f32) -> bool {
2    let diff = first - second;
3    diff.abs() < 0.000001
4}
5
6pub fn f32_max(first: f32, second: f32) -> f32 {
7    if first > second { first } else { second }
8}
9
10pub fn option_f32_to_f32_two_decimals_with_none_as_zero(value: Option<f32>) -> f32 {
11    match value {
12        Some(float) => f32_to_two_decimals(float),
13        None => 0.0,
14    }
15}
16pub fn f32_to_two_decimals(value: f32) -> f32 {
17    (value * (100_f32)).round() / (100_f32)
18}
19
20pub fn f32_to_three_decimals(value: f32) -> f32 {
21    (value * (1000_f32)).round() / (1000_f32)
22}
23
24#[cfg(test)]
25mod tests {
26    use super::*;
27
28    #[test]
29    fn f32_approx_eq_works() {
30        assert!(!f32_approx_eq(1.0, 1.1));
31        assert!(!f32_approx_eq(-1.1, 1.1));
32        assert!(!f32_approx_eq(1.1, -1.1));
33        assert!(f32_approx_eq(1.1, 1.1));
34        assert!(f32_approx_eq(0.0, 0.0));
35    }
36
37    #[test]
38    fn f32_to_two_decimals_works() {
39        assert_eq!(f32_to_two_decimals(1.0), 1.0);
40        assert_eq!(f32_to_two_decimals(1.1), 1.1);
41        assert_eq!(f32_to_two_decimals(1.111_111), 1.11);
42        assert_eq!(f32_to_two_decimals(1.355555), 1.36);
43        assert_eq!(f32_to_two_decimals(1.000000001), 1.0);
44    }
45
46    #[test]
47    fn f32_to_three_decimals_works() {
48        assert_eq!(f32_to_three_decimals(1.0), 1.0);
49        assert_eq!(f32_to_three_decimals(1.1), 1.1);
50        assert_eq!(f32_to_three_decimals(1.111_111), 1.111);
51        assert_eq!(f32_to_three_decimals(1.355555), 1.356);
52        assert_eq!(f32_to_three_decimals(1.000000001), 1.0);
53    }
54}
headless_lms_utils/numbers.rs

headless_lms_utils/
numbers.rs
