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.
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:
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, num
remains unchanged after the call modify
because 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
}
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 = 20
The value remains the same, as changes inside modify
do not affect num
the outside main
.
Function arguments in Golang
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 = 50
Since num
it is passed by reference, the command modify
will change its value, which is reflected in the command main
.
What is a Constant or Const in Golang? Here's what you need to know about using constants in Go.
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.
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.
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:
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.
Golang like most other programming languages has switch statement. Here is how to use switch statement 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 structs in Golang are temporary structures with no names used for one-time purposes, while anonymous fields allow embedding of unnamed fields.
What is Rune in Golang? How to use Rune in Golang? This article will give you the answer.
Operators allow us to perform different types of operations on operands. In Go language, operators can be classified based on their different functions.
_(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.
Golang can be easily installed on Windows. Here is a step-by-step guide to install Golang on Windows.
Smart TVs have really taken the world by storm. With so many great features and the ability to connect to the Internet, technology has changed the way we watch TV.
Refrigerators are familiar appliances in families. Refrigerators usually have 2 compartments, the cool compartment is spacious and has a light that automatically turns on every time the user opens it, while the freezer compartment is narrow and has no light.
Wi-Fi networks are affected by many factors beyond routers, bandwidth, and interference, but there are some smart ways to boost your network.
If you want to go back to stable iOS 16 on your phone, here is the basic guide to uninstall iOS 17 and downgrade from iOS 17 to 16.
Yogurt is a great food. Is it good to eat yogurt every day? What will happen to your body when you eat yogurt every day? Let's find out together!
This article discusses the most nutritious types of rice and how to maximize the health benefits of whichever rice you choose.
Establishing a sleep schedule and bedtime routine, changing your alarm clock, and adjusting your diet are some of the measures that can help you sleep better and wake up on time in the morning.
Rent Please! Landlord Sim is a simulation mobile game on iOS and Android. You will play as a landlord of an apartment complex and start renting out an apartment with the goal of upgrading the interior of your apartments and getting them ready for rent.
Get Bathroom Tower Defense Roblox game codes and redeem them for exciting rewards. They will help you upgrade or unlock towers with higher damage.
Let's learn about the structure, symbols and operating principles of transformers in the most accurate way.
From better picture and sound quality to voice control and more, these AI-powered features are making smart TVs so much better!
DeepSeek initially had high hopes. As an AI chatbot marketed as a strong competitor to ChatGPT, it promised intelligent conversational capabilities and experiences.
It's easy to miss important details when you're jotting down other essentials, and trying to take notes while chatting can be distracting. Fireflies.ai is the solution.
Axolot Minecraft will be a great assistant for players when operating underwater if they know how to use them.
A Quiet Place: The Road Ahead's configuration is rated quite highly, so you will need to consider the configuration before deciding to download.