Function filter_scales 

pub fn filter_scales<F>(filter: F) -> Result<Vec<Scale>, ScaleOmnibusError>
where
    F: Fn(&Scale) -> bool,

Filters scales based on a provided closure.

Arguments

• filter - A closure that takes a &Scale and returns true if the scale matches the filter.

Returns

A Vec<Scale> containing the filtered scales.

Example

// Find all the scales with "Major" in the name:
let major_scales = scale_omnibus::filter_scales(|scale| scale.name.contains("Major")).unwrap();
// Bebop Major is among them:
assert!(major_scales.contains(&scale_omnibus::get_scale("Bebop Major").unwrap()));

// Find all the scales with 12 intervals:
let filtered_scales = scale_omnibus::filter_scales(|scale| {
        scale
            .intervals
            .as_ref()
            .map_or(false, |intervals| intervals.len() == 12)
}).unwrap();
// Well, there's only one of those:
assert_eq!(filtered_scales, vec![scale_omnibus::get_scale("Chromatic").unwrap().clone()]);