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Function: toMinMaxBy()

toMinMaxBy<Value>(fn): OptionalReducer<MinMax<Value>>

Returns an optional reducer that finds the MinMax value of the values it receives based on the fn Compare function.

Use when composing reducers. Prefer minMaxBy for direct use on iterables.

Type Parameters​

• Value

Parameters​

• fn: Compare<Value>

Returns​

OptionalReducer<MinMax<Value>>

Example​

console.log(
  pipe(
    [`sloth`, `more sloth`, `sleep`, `some sloth`],
    map(string => [string.length, string]),
    reduce(toGrouped(toMinMaxBy((s1, s2) => s1.localeCompare(s2)), toMap())),
  ),
)
//=> Map(2) {
//=>   5 => { min: 'sleep', max: 'sloth' },
//=>   10 => { min: 'more sloth', max: 'some sloth' }
//=> }

Defined in​

statistics.d.ts:518