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.
Void identifier in Golang
_(underscore) in Golang is called Blank Identifier . Identifier is a user-defined name of program elements used for identification purposes.
Golang has a special feature of defining and using unused variables using Blank Identifier. Unused variables are those variables that are defined by the user during the program but he never uses them. These variables make the program almost unreadable. As you know, Golang is a more concise and readable programming language so it does not allow the programmer to define an unused variable. If you do so, the compiler will give you an error.
The real use of Blank Identifier comes when a function returns multiple values, but we only need a few values and need to get rid of the extra ones. It basically tells the compiler that this variable is not needed and ignores it without any error. It hides the values of the variable and makes the program readable. So whenever you assign a value to Blank Identifier, it will not be used.
Example 1: In the program below, the function mul_div returns two values and we store both values in mul and div identifiers . But in the entire program, we are using only one variable i.e. mul . So, the compiler will throw an error that div is declared and not used.
// Chương trình Go hiện trình biên dịch
// báo lỗi nếu một biến
// được khai báo nhưng không được sử dụng
package main
import "fmt"
// Hàm chính
func main() {
// gọi hàm này
// hàm trả về hai giá trị được gán
// cho định danh mul và div
mul, div := mul_div(105, 7)
// chỉ dùng biến mul
// trình biên dịch sẽ báo lỗi
fmt.Println("105 x 7 = ", mul)
}
// hàm trả về hai
// giá trị của kiểu integer
func mul_div(n1 int, n2 int) (int, int) {
// trả về các giá trị này
return n1 * n2, n1 / n2
}
Result:
./prog.go:15:7: div được khai báo nhưng không được dùngExample 2: Use the Blank identifier to fix the above program. Instead of the div identifier, just use _ (underscore) . It allows the compiler to ignore the declaration error and not use it for that particular variable.
// Chương trình Go dùng định danh trống
package main
import "fmt"
// Hàm chính
func main() {
// gọi hàm này
// hàm trả về hai giá trị
// được gán cho định danh mul và trống
mul, _ := mul_div(105, 7)
// chỉ dùng biến mul
fmt.Println("105 x 7 = ", mul)
}
// hàm trả về hai giá trị
// của kiểu integer
func mul_div(n1 int, n2 int) (int, int) {
// trả về giá trị này
return n1 * n2, n1 / n2
}
Result:
105 x 7 = 735Important points to remember:
- You can use multiple blank identifiers in the same program. So you can say that a Golang program can have multiple variables using the same identifier name blank.
- There are many cases where a value is required just to complete the syntax even though the values are known to not be used anywhere in the program. Like a function that returns multiple values. Most of such cases use the blank identifier.
- You can use any value of any type with Blank Identifier.
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 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 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.
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.
Methods with the same name in Golang
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.
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.
Variable Scope in Go
The scope of a variable in Golang determines which part of the program the variable is accessible to. In Go, all identifiers have a lexical scope that is determined at compile time.
External monitors can have a negative impact on laptop batteries.
Using a laptop with an external monitor is a great combination for productivity and getting work done. But over time, you may find that your laptop suddenly runs out of battery quickly and the battery life starts to decrease.
8 major disadvantages of foldable screen phones that you didnt expect
There’s no denying that foldable phones are pretty cool. But after using them for a while, there are a few quirks to them. Here are 5 major downsides to foldable phones that you might not expect!
Adobe is bringing AI video creation technology to Premiere Pro
Adobe has brought AI video creation technology to the masses in a new way, although it has yet to create a finished movie using the technology.
Latest Genshin Impact Codes April 2025
Genshin Impact 5.5 Code helps you exchange for Primordial Stones, Magic Minerals, experience and many other rewards.
How to Turn Your iPad into an Extra Mac Display
macOS Catalina and iPadOS include support for a new feature called Sidecar, designed to let you use your iPad as a secondary display for your Mac.
Wallpaper 1280, beautiful Nokia 1280 phone wallpaper
This is a set of Nokia 1280 wallpapers, if you have ever texted to get 1280 wallpapers, brick phone wallpapers, then try looking at these wallpapers.
Hypersonic space plane reaches speed of 11,115 km/h
Venus Aerospace has revealed the first images of its new hypersonic aircraft called the Stargazer, which can reach a top speed of 11,115 km/h, equivalent to Mach 9.
Eating bananas for breakfast helps you reduce bloating
Bloating can happen to anyone. The good news is that breakfast is a great time to add a few ingredients to your meal that can help reduce bloating. That ingredient is bananas.
OpenAI Announces Major Update to AI Image Generation in ChatGPT
OpenAI has just officially introduced a remarkable upgrade to the AI image generation capability in ChatGPT, an important step forward instead of using a separate image generation model like the previous DALL-E.
Deepseek Releases Free Language Model v3 That Runs Well on Common Hardware Configurations
Chinese AI startup DeepSeek has just officially released its latest large language model (LLM), DeepSeek-V3-0324.
Reasons to ditch Gboard and switch to Samsung Keyboard
Gboard has long been the go-to keyboard on Android phones. However, many people have recently switched to Samsung Keyboard and haven't looked back.
Sweet and Romantic Weekend Wishes for Lovers
Send sweet and romantic weekend wishes to your lover. Although they are just words or messages, they will be meaningful spiritual gifts, helping to strengthen your relationship.
Harry Potter TV series needs the following elements to be successful
HBO's Harry Potter remake is expected to premiere in 2026. Here's what makes the TV Harry Potter a success.
Stunning pictures of the supermoon from around the world
Beautiful moon pictures are not rare on the Internet. This article will summarize for you the most beautiful moon pictures in the world.
AMD Ryzen Users Should Install This BIOS Update for a Free Performance Boost
Now, AMD has responded to the issues with its underperforming flagship CPU line with a new update that could deliver a few more frames per second.