/**
 *****************************************
 * Created by edonet@163.com
 * Created on 2019-11-30 21:46:44
 *****************************************
 */
'use strict';


/**
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 * 加载依赖
 *****************************************
 */
import { Extend, O } from './d';


/**
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 * 挑选属性
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 */
function pick<T>(origin: T): T;
function pick<T, P extends keyof T>(origin: T, keys: P[]): Pick<T, P>;
function pick<T, P, Q extends keyof P>(target: T, origin: P, keys: Q[]): Extend<T, Pick<P, Q>>;
function pick(target: O, origin?: unknown, keys?: unknown): unknown {

    // 重载函数
    if (typeof keys === 'undefined') {
        return pick({}, target, origin as [] || Object.keys(target));
    }

    // 拷贝属性
    if (Array.isArray(keys)) {
        keys.forEach((key: string) => {
            target[key as keyof O] = (origin as O)[key as keyof O];
        });
    }

    // 返回结果
    return target;
}


/**
 *****************************************
 * 抛出接口
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 */
export { pick };