Go language type: array slice

At first glance, an array slice is like a pointer to an array, and in fact it has its own data structure, not just a pointer. The data structure of an array slice can be abstracted into the following 3 variables:

1. A pointer to a native array;

2. The number of elements in the array slice;

3. The array slice has allocated storage space.

Slice is not a value type, but a reference type, just like a pointer, writing to a slice-made element actually affects the underlying array layer, slice really just a thin layer of operation encapsulation. Thus, slice has an important purpose as a function parameter, which avoids passing the array directly and causing the entire array to have a memory copy.

Go language type: array slice