Function: toJoin()

toJoin(separator): Reducer<unknown, unknown, string>

Returns a Reducer that concatenates values to a string where values are separated by separator.

Joins like Array.prototype.join, but does not treat null, undefined, or [] specially.

Use when composing reducers. Prefer join, joinAsync, and joinConcur for direct use on iterables.

Parameters

separator

string

Returns

Reducer<unknown, unknown, string>

Example

import { map, pipe, reduce, toGrouped, toJoin, toMap } from 'lfi'

console.log(
  pipe(
    [`sloth`, `lazy`, `sleep`],
    map(word => [word.length, word]),
    reduce(toGrouped(toJoin(`,`), toMap())),
  ),
)
//=> Map(2) {
//=>   5 => 'sloth,sleep',
//=>   4 => 'lazy'
//=> }

Playground

Since

v2.0.0

Defined in

collections.d.ts:423