/**
 * Insert a value or an object in a list. Doesn't change the original list.
 *
 * @param what - Something to insert
 * @param indexWhere - Index in the list
 *
 * @example
 * modifiedArray = insert( array, obj, 2 )
 *
 * @returns New modified array
 */
export function insert(list: any[], what: any, indexWhere: number): any[] {
    const listLength = list.length;

    if (!listLength) {
        return [what];
    }

    if (indexWhere <= 0) {
        return [what, ...list];
    }

    if (indexWhere >= listLength) {
        return [...list, what];
    }

    return [
        ...list.slice(0, indexWhere),
        what,
        ...list.slice(indexWhere, list.length),
    ];
}