headTail | /deps.ts | dom_diff@1.0.0-beta.2

function headTail

import { headTail } from "https://deno.land/x/dom_diff@1.0.0-beta.2/deps.ts";

headTail<T, U extends readonly unknown[]>(array: readonly [T, ...U]): [T, U]

Split the sequence into head and tail.

headTail<T extends string, U extends string>(string: `${T}${U}`): [T, U]

headTail<T, U = T>(seq: Readonly<Sequence<T, U>>): [T | undefined, U]

Split the sequence into head and tail.

Examples

Example 1

import { headTail } from "https://deno.land/x/seqtools/head_tail.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";

assertEquals(headTail([1, 2, 3]), [1, [2, 3]]);
assertEquals(headTail("abc"), ["a", "bc"]);
assertEquals(headTail([]), [undefined, []]);