Join

Since v1.3.0

Join a tuple of string literals into a single string type with a separator. Concatenates all strings in the tuple with the separator between each element.

Signature

export type Join<T extends string[], S extends string> = T extends [infer First extends string]
	? First
	: T extends [infer First extends string, ...infer Rest extends string[]]
		? `${First}${S}${Join<Rest, S>}`
		: ''

Parameters

Parameter	Description
T	The tuple of string literals to join
S	The separator string to insert between elements

Examples

Basic Usage

import type { Join } from 'uni-types'

type Result = Join<['a', 'b', 'c'], '-'>
// 'a-b-c'

Joining Words

import type { Join } from 'uni-types'

type Sentence = Join<['hello', 'world'], ' '>
// 'hello world'