/**
 * 从对象数组中取出一个对象
 * 
 * @example
 * pickObject([{id:123},{id:200}], "id", 123)   // {id:123}
 */
export function pickObject<T>(arr: T[], key: string, value: any): T | void {
    return arr.find((item: any) => item && item[key] == value)
}