Function by

by<V, K>(selector: (value: V) => K, comparator?: Comparator<K>): Comparator<V>
Creates a comparator that compares values by a selected key.

Values are ordered by a key taken from each of them, such as a property, and keys are ordered by comparator.
Type Parameters
- V
  The type of values to compare
- K
  The type of keys to compare
Parameters
- selector: (value: V) => K
  Function that extracts the comparison key from a value
- comparator: Comparator<K> = ascending
  Comparator to apply to the extracted keys (defaults to ascending)
Returns Comparator<V>
A comparator ordering values by their selected keys
- Defined in patterns/order.ts:218