What is the difference between slices and variables in go language?

Go language slices and variables are: 1. Slices are a reference type, and variables are a value type; 2. Slices have the ability to dynamically expand, while the size of variables is fixed; 3. Slices Partial elements can be extracted through slicing expressions, while variables can only access the entire value; 4. Slices can also share underlying data with other slices, while variables are independent.

The operating environment of this tutorial: windows10 system, golang1.20.1 version, DELL G3 computer.

In Go language, slice and variable are two very important concepts. While they can both be used to store data, there are some clear differences between them. This article will focus on the difference between slices and variables in the Go language.

1. Slice is a reference type, and variable is a value type. In Go language, a reference type variable allocates memory when it is created and stores its pointer (memory address) in the variable. For value type variables, the actual value is stored directly in the variable. This causes slices to always be passed by reference, while variables are passed by value. This means that when passing a slice, you are actually passing the underlying data address of the slice, rather than a copy of the entire slice. When passing a variable, a copy of the variable is created and passed.

2. Slices have the ability to dynamically expand, while the size of variables is fixed. In the underlying implementation of slicing, an initial capacity is allocated and automatically expanded as needed. When the length of the slice exceeds the initial capacity, the slice will automatically reallocate larger memory and copy the original data to the new memory address. This makes slicing very flexible when dealing with uncertain amounts of data. The size of a variable is determined when it is created and cannot be increased or decreased at will.

3. Slicing can extract some elements through slicing expressions, while variables can only access the entire value. Slice expressions use a fixed syntax to select a range of elements in a slice. By specifying an index, you can extract any subset of the slice. This makes slicing very convenient in collection operations. A variable can only store a complete value, and a similar syntax cannot be used to extract a part of it.

4. Slices can also share underlying data with other slices, while variables are independent. When a slice is divided into multiple sub-slices, the sub-slices share the same underlying data as the original slice. This means that modifications to sub-slices will affect other slices that share the underlying data. Variables are stored independently and do not share memory with other variables.

In summary, there is a clear difference between slices and variables in the Go language. Slices are reference types that pass data addresses; they have the ability to dynamically expand; they can use slice expressions to extract some elements; they can share underlying data with other slices. The variable is a value type, and what is passed is a copy of the data; the size is fixed; some elements cannot be extracted; it is stored independently and does not share memory with other variables. Understanding these differences is important for using slices and variables correctly, making your code more efficient and reliable. .

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