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Overview of reference types in Go language
Go language is an open source programming language developed by Google. One of its design goals is to be concise, efficient, and easy to use. . In the Go language, reference types are a special data type that store references to data in memory rather than the data itself. This article will introduce reference types in Go language and provide specific code examples.
Reference types include slice, map, channel and function. These types are all reference types in the Go language, so they are passed by reference when passing and assigning, that is, the address of the data in memory is passed, not a copy of the data. This allows you to avoid unnecessary memory overhead when processing large amounts of data.
First, let us look at the use of the reference type slice. A slice is a dynamic array that automatically expands its capacity as needed. Here is a sample code that creates a slice and modifies its elements:
package main import "fmt" func main() { // 创建一个初始容量为3的切片 s := make([]int, 0, 3) // 添加元素到切片中 s = append(s, 1) s = append(s, 2) // 修改切片中的元素 s[1] = 3 // 打印切片的内容 fmt.Println(s) }
In the above code, we use the make
function to create a slice with an initial capacity of 3, and then use ## The #append function adds elements to the slice, modifies the elements in the slice by index, and finally prints out the contents of the slice.
package main import "fmt" func main() { // 创建一个映射,键为string类型,值为int类型 m := make(map[string]int) // 向映射中添加键值对 m["one"] = 1 m["two"] = 2 // 修改映射中的值 m["two"] = 3 // 打印映射的内容 fmt.Println(m) }In the above code, we use the
make function to create a map, then add key-value pairs to the map, and modify the values in the map through the keys , and finally print out the mapped content.
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