Type Alias DropLast<T, Cases>

DropLast: number extends T["length"]
    ? Cases["$array"]
    : T["length"] extends 0
        ? Cases["caseEmptyTuple"]
        : T["length"] extends 1
            ? []
            : T extends [...(infer Heads), any] ? Heads : never

⚗️ transform 🔢 customizable

Drops the last entry in the tuple T.

If the type is an array, the same array will be returned.

Type Parameters

T extends unknown[]
Cases extends DropLast.Options = DropLast.DefaultOptions<T>

Example

type R = DropLast<[1, 2, 3]> // [2, 3]
type R = DropLast<[string]> // []
type R = DropLast<[]> // []
type R = DropLast<string[]> // string[]

Type Param: Options['$array']

Return type when T is Array. Default to T.

Type Param: Options['caseEmptyTuple']

Return type when T is an empty tuple. Default to [].