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sebinsua/join.ts

Last active August 10, 2022 18:50
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join.ts
type GetTail<Items extends string[]> = Items extends [any, ...infer Tail]
? Tail
: string[];
type HasTail<Items extends string[]> = Items extends [any, any, ...any[]]
? true
: false;
type Join<Strs extends string[], Delimiter extends string = ""> = HasTail<Strs> extends false
? Strs[0] extends string ? Strs[0] : ''
: Strs extends string[] ? `${Strs[0]}${Delimiter}${Join<GetTail<Strs>, Delimiter>}` : '' ;
type Goal = Join<["Make", "anxiety", "work", "for", "you!"], ' '>
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