How to use constants in Golang
What is a Constant or Const in Golang? Here's what you need to know about using constants in Go.
Function arguments in Golang
In Golang , a function is a group of statements used to perform tasks, with an optional return value . Go supports two main ways to pass arguments: Pass by value and Pass by reference. Go uses pass by value by default.
Basic terms in passing parameters to functions:
- Actual parameters: The arguments passed to the function.
- Formal parameters: The parameters received by the function.
For example
package main
import "fmt"
// Cố gắng sửa đổi giá trị của num
func modify(num int) {
num = 50
}
func main() {
num := 20
fmt.Printf("Before, num = %d\n", num)
modify(num)
fmt.Printf("After, num = %d\n", num)
}In this example, numremains unchanged after the call modifybecause it is passed by value.
Syntax
func functionName(param Type) {
// function body # Gọi theo giá trị
}
func functionName(param *Type) {
// function body # Gọi theo tham chiếu
}Call by value
In call-by-value, a copy of the actual parameter value is passed. Changes made in the function do not affect the original variable.
Syntax
func functionName(param Type) {
// function body
}For example:
package main
import "fmt"
// Chỉnh sửa giá trị của num
func modify(num int) {
num = 50
}
func main() {
num := 20
fmt.Printf("Before, num = %d\n", num)
modify(num)
fmt.Printf("After, num = %d\n", num)
}
Result:
Before, num = 20
After, num = 20The value remains the same, as changes inside modifydo not affect numthe outside main.
Function arguments in Golang
Call by reference
In call-by-reference, a pointer to the actual parameter is passed, so any changes inside the function are reflected on the original variable.
Syntax
func functionName(param *Type) {
// function body
}For example:
package main
import "fmt"
// Chỉnh sửa giá trị của num qua tham chiếu
func modify(num *int) {
*num = 50
}
func main() {
num := 20
fmt.Printf("Before, num = %d\n", num)
modify(&num)
fmt.Printf("After, num = %d\n", num)
}
Result
Before, num = 20
After, num = 50Since numit is passed by reference, the command modifywill change its value, which is reflected in the command main.
Volatile functions in Golang
Variadic functions in Go allow you to pass a variable number of arguments to a function. Here's everything you need to know about variadic functions in Golang.
Named return parameters in Golang
In 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.
Keywords in Go
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 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:
Function returning multiple values in Golang
In Go 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.
Switch Statement in Go
Golang like most other programming languages has switch statement. Here is how to use switch statement in Golang.
Cases to know when using selection statements in Golang
In this article, we will learn how to use default case to avoid deadlock. But first, we will learn what is deadlock case when using select command in Golang?
Anonymous structures and fields in Golang
Anonymous structs in Golang are temporary structures with no names used for one-time purposes, while anonymous fields allow embedding of unnamed fields.
How to use Rune in Golang
What is Rune in Golang? How to use Rune in Golang? This article will give you the answer.
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.
How to create basic program in Golang
Hello, World! is the first basic program in any programming language. You can write this first program in Golang by following the steps below.
How to Install Go on Windows
Golang can be easily installed on Windows. Here is a step-by-step guide to install Golang on Windows.
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