The scope of a variable in Golang determines which part of the program the variable is accessible to. In Go, all identifiers have lexical scope, meaning the scope can be determined at compile time. A variable is only accessible within the block of code in which it is defined.
For example:
package main
import "fmt"
// Khai báo biến toàn cụ
var myVariable int = 100
func main() {
// Biến cục bộ trong hàm chính
var localVar int = 200
fmt.Printf("Inside main - Global variable: %d\n", myVariable)
fmt.Printf("Inside main - Local variable: %d\n", localVar)
display()
}
func display() {
fmt.Printf("Inside display - Global variable: %d\n", myVariable)
}Variable scope syntax in Golang
var variableName type = value Local variables
Local variables are declared within a function or a block and cannot be accessed outside that block. They can also be declared within loops and conditionals but are limited to the scope of the block.
For example:
package main
import "fmt"
func main() {
var localVar int = 200 // Biến cục bộ
fmt.Printf("%d\n", localVar) // Có thể truy cập tại đây
}
Result:
200Global variables
Global variables are defined outside any function or block, making them accessible throughout the entire program.
For example:
package main
import "fmt"
// Khai báo biến toàn cục
var myVariable int = 100 // Biến toàn cục
func main() {
fmt.Printf("%d\n", myVariable) // Có thể truy cập tại đây
}
Result:
100Local variable priority
When a local variable has the same name as a global variable, the local variable takes precedence within its scope.
For example:
package main
import "fmt"
// Khai báo biến toàn cục
var myVariable int = 100 // Biến toàn cục
func main() {
var myVariable int = 200 // Biến cục bộ
fmt.Printf("Local variable takes precedence: %d\n", myVariable) // Truy cập biến cục bộ
}
Result:
Biến cục bộ có mức độ ưu tiên: 200In Golang, named return parameters are often referred to as named parameters. Golang allows naming the return parameters or results of functions in the function signature or definition.
Keyword - Keywords are words in a language that are used for some internal processes or represent some predefined actions. Here is what you need to know about keywords in Golang.
Data types specify what type of data a valid Go variable can hold. In the Go language, types are divided into four categories as follows:
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_(underscore) in Golang is called Blank Identifier. Identifier is a user-defined name of program elements used for identification purposes.
Hello, World! is the first basic program in any programming language. You can write this first program in Golang by following the steps below.
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Golang allows creating two or more methods with the same name in the same package, but the receivers of these methods must be of different types.
In Go, functions are blocks of code that perform specific tasks, which can be reused throughout the program to save memory, improve readability, and save time.
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