Function arguments in Golang
Go supports two main ways to pass arguments: Pass by Value and Pass by Reference. Go uses pass by value by default.
Function returning multiple values in Golang
In Golang language , you are allowed to return multiple values from a function, using the return statement. In other words, in a function, a return statement can return multiple values. The type of the returned values is similar to the type of the parameter specified in the parameter list.
Syntax:
func function_name(parameter_list)(return_type_list){
// code...
}In there:
- function_name : This is the name of the function.
- parameter-list : Contains the names and types of the function parameters.
- return_type_list : Optional and contains the types of values that the function returns. If you are using return_type in your function, then you need to use the return statement in your function.
For example:
// Chương trình Go minh họa
// cách hàm trả về nhiều giá trị
package main
import "fmt"
// myfunc trả về 3 giá trị của kiểu int
func myfunc(p, q int)(int, int, int ){
return p - q, p * q, p + q
}
// Phương thức chính
func main() {
// Giá trị trả về được gắn vào
// 3 biến khác nhau
var myvar1, myvar2, myvar3 = myfunc(4, 2)
// Hiện giá trị
fmt.Printf("Result is: %d", myvar1 )
fmt.Printf("\nResult is: %d", myvar2)
fmt.Printf("\nResult is: %d", myvar3)
}
Result:
Result is: 2
Result is: 8
Result is: 6Name the return value
In Go language, you are allowed to provide names for return values. And you can also use those variable names in your code. There is no need to write these names with return statement because Go compiler will automatically understand that these variables should be retained. And the return type is called minimal return. Minimal return reduces duplication in your program.
Syntax:
func function_name(para1, para2 int)(name1 int, name2 int){
// code...
}
hoặc
func function_name(para1, para2 int)(name1, name2 int){
// code...
}Here, name1 and name2 are the names of the return value and para1 and para2 are the parameters of the function.
For example:
// Minh họa chương trình Go
// cách đặt tên cho giá trị trả về
package main
import "fmt"
// myfunc trả về 2 giá trị của kiểu int
// đây là tên giá trị trả về:
// rectangle và square
func myfunc(p, q int)( rectangle int, square int ){
rectangle = p*q
square = p*p
return
}
func main() {
// Giá trị trả về được gán cho
// hai biến khác nhau
var area1, area2 = myfunc(2, 4)
// Hiện giá trị
fmt.Printf("Area of the rectangle is: %d", area1 )
fmt.Printf("\nArea of the square is: %d", area2)
}
Result:
Area of the rectangle is: 8
Area of the square is: 4Switch Statement in Go
Golang like most other programming languages has switch statement. Here is how to use switch statement in Golang.
How to use operators in Golang
Operators allow us to perform different types of operations on operands. In Go language, operators can be classified based on their different functions.
Void identifier in Golang
_(underscore) in Golang is called Blank Identifier. Identifier is a user-defined name of program elements used for identification purposes.
Functions in Go
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.
How to use variables in Golang
In Go language, Identifier can be a variable name, function name, constant, statement label, package name or type. Here is what you need to know about using Identifier in Golang.
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