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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​

console.log(
  pipe(
    [`sloth`, `more sloth`, `sleep`, `some sloth`],
    map(string => [string.length, string]),
    reduce(toGrouped(toJoin(`,`), toMap())),
  ),
)
//=> Map(2) { 5 => 'sloth,sleep', 10 => 'more sloth,some sloth' }

Defined in​

collections.d.ts:374