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pick_fields

harn_kernel::pure

Function pick_fields 

Source 
pub fn pick_fields<'a, V>(
    keys: impl IntoIterator<Item = &'a str>,
    lookup: impl FnMut(&str) -> Option<V>,
) -> BTreeMap<String, V>
Expand description

Select existing fields without changing their values. Lookup belongs to the value adapter so records, structs, and Harness handles use one rule.