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Variable: toJoin()

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

Defined in: collections.d.ts:423

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