The `concat()` method returns a new array comprised of the array on which it is called joined with the array(s) and/or value(s) provided as arguments. Arrays and/or ...

**参数:**collect()方法接受一个转换为集合的参数，然后 concat()函数也接受一个数组。 **返回值:**返回合并的数组或对象。 const ...