CharAt | /typical/str.ts | rimbu@1.0.2

Using Deno in production at your company? Earn free Deno merch.

Rimbu is a TypeScript library focused on immutable, performant, and type-safe collections and other tools.

type alias CharAt

import { type CharAt } from "https://deno.land/x/rimbu@1.0.2/typical/str.ts";

Returns the character in the given string at the given Index, or false if the index is out of bounds.

Examples

Example 1

CharAt<'abcd', 1> => 'b'
CharAt<'abcd', 5> => false

S extends string

Index extends number

definition: S extends Append<infer Start, infer Rest> ? U.Extends<Index, 0, Start, CharAt<Rest, Num.Decr<Index>>> : false