What is go language slicing?

Go language slice is an abstraction of arrays. A slice is a reference to an array, containing pointers to array elements, the length and capacity of the slice. The ways to create a slice are: 1. Use the built-in make function to create a slice; 2. Use the slice literal to create a slice; 3. Create a new slice from another slice. You can use the built-in append function to add elements to a slice, or you can use the built-in copy function to copy elements from one slice to another, thus changing the length of the slice.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Slice in Go language is an abstraction of arrays, which provides a convenient and flexible way to operate arrays. A slice is a reference to an array, which contains pointers to the array elements, the length and capacity of the slice.

In the Go language, slices can be created in the following ways:

1. Create a slice using the built-in make function. For example, slice := make([]int, 5, 10) creates an integer slice with an initial length of 5 and a capacity of 10.

2. #Create a slice using the slice literal. For example, slice := []int{1, 2, 3} creates a slice containing three integers.

3. Create a new slice from another slice. For example, slice := oldSlice[0:3] creates a new slice that contains the 0th, 1st, and 2nd elements of the original slice.

The length of a slice represents the number of elements in the slice, while the capacity represents the number of elements that can be accommodated in the underlying array. The capacity is not equal to the length of the array referenced by the slice, but the size of the space allocated by the underlying array. The length of the slice can be obtained through the len function, and the capacity of the slice can be obtained through the cap function.

How to extend or shorten a slice?

You can use the built-in append function to add elements to a slice, which will modify the length and capacity of the slice. You can also use the built-in copy function to copy elements from one slice to another, thereby changing the length of the slice.

The bottom layer of the slice:

The bottom layer of the slice is an array. When you create a slice, you actually create a reference to the underlying array. By modifying an element in a slice, you actually modify an element in the underlying array by reference. Therefore, operations on slices may affect the state of the underlying array.

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