import { isNullOrUndefined } from "util";

export function isNullOrEmpty(arrayValue: Array<any> | Set<any>): boolean {
    if (arrayValue instanceof Array) {
        return isNullOrUndefined(arrayValue) || arrayValue.length === 0;
    } else if (arrayValue instanceof Set) {
        return isNullOrUndefined(arrayValue) || arrayValue.size === 0;
    } else {
        return false;
    }
}

export function isNotNullAndNotEmpty(arrayValue: Array<any> | Set<any>): boolean {
    if (arrayValue instanceof Array) {
        return !isNullOrUndefined(arrayValue) && arrayValue.length > 0;
    } else if (arrayValue instanceof Set) {
        return !isNullOrUndefined(arrayValue) && arrayValue.size > 0;
    } else {
        return false;
    }
}

export function concat<T>(list_1: T[], list_2: T[]): T[] {
    if (!isNullOrUndefined(list_1) && !isNullOrUndefined(list_2)) {
        return list_1.concat(list_2);
    } else if (!isNullOrUndefined(list_1)) {
        return list_1;
    } else if (!isNullOrUndefined(list_2)) {
        return list_2;
    }
    return undefined;
}

export function removeItem<T>(list: T[], item: T): void {
    if (!isNullOrUndefined(list)) {
        let index: number = list.findIndex(element => element === item);
        if (index >= 0) {
            list.splice(index, 1);
        }
    }
}