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/** * **nth** returns element under given index, if negative index is provided element at (length + index) is returned * @param i index * @param xs a list of elements or a string  * @returns an element or a character */export default function nth(i: number, xs: string | any[]): string | any[] {    if (i < 0) {        return xs[xs.length + i];    }
    return xs[i];}