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

In the Go language, variables and slices are two different data structures with different characteristics and usage. Variables store a single value, while slices store multiple values ​​and have dynamic sizes. Variables have a fixed size and can be allocated via assignment, whereas slices are created using the make() function and can grow or shrink dynamically in size. The value of a variable can be changed directly through assignment, whereas changing the value of a slice requires assignment through an index.

The difference between slices and variables in Go language

In Go language, slices and variables are two different kinds of data Structures, with different properties and usage.

Variables

Variables store a single value, which can be a primitive type (such as int, float64, bool, etc.) or a custom type. Variables can be assigned values ​​and their values ​​can be changed at any time.

Slice

A slice is a dynamically sized array that stores multiple elements of the same type. A slice has a pointer to the underlying array and a length indicating the number of elements contained in the slice.

Main difference

• Storage: Variables store a single value, while slices store multiple values.
• Size: Variables have a fixed size, while the size of a slice can grow or shrink dynamically.
• Allocation: Variables are allocated by assignment, while slices are created using the make() function.
• Value change: The value of a variable can be changed directly through assignment. To change the value of a slice, you need to assign a value to a specific element in the slice through an index.

Practical case

The following code creates a variable that stores integers and a slice that stores integers:

var num int = 42
nums := []int{1, 2, 3, 4, 5}

The following code changes the values ​​of variables and slices:

num = 100
nums[2] = 8

Result:

The value of variable num has been changed to 100, while the value of slice nums The value of the third element has been changed to 8.

Conclusion

Variables and slices are different data structures in Go language. Variables store a single value while slices store multiple values ​​and have dynamic size. Understanding the differences between them is crucial to using the Go language effectively.

The above is the detailed content of What is the difference between slices and variables in Go language?. For more information, please follow other related articles on the PHP Chinese website!