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.
Named return parameters in Golang
In Golang , named return parameters are commonly known as named parameters. Golang allows naming the return parameters or results of functions in the function signature or definition. Or you can say it is the explicit naming of return variables in the function definition. It basically removes the need to mention the variable name with the return statement. By using named return parameters or named parameters, one can simply use the return keyword at the end of the function to return the result to the caller. This concept is commonly used when a function has to return multiple values. So, for the convenience of the users and to increase the readability of the code, Golang provides this facility.
Declare named return parameters
To declare a named result or return parameter, simply use the return type part of the function signature. Here is the general syntax for declaring a function in Golang. The syntax for declaring a function without a named return parameter is:
func function_name(Parameter-list)(Return_type){
// function body.....
}Here, Return_Type is optional and it contains the type of value that the function returns. If you are using Return_Type in your function, then you need to use the return statement in your function.
The syntax to declare a function with a named return argument is:
func function_name(Parameter-list)(result_parameter1 data-_type, result_parameter2 data_type, ….){
// function body…..
return
} Here, (result_parameter1 data-_type, result_parameter2 data_type, ….) is the list of named return arguments along with their types. You can declare n number of named return parameters.
Example: Example: In the program below, the line func calculator(a, b int) (mul int, div int) contains named return arguments. The return statement at the end of the function does not contain any parameters. The Go compiler will automatically return the parameters.
// Chương trình Go mình họa
// cách dùng đối số trả về được đặt tên
package main
import "fmt"
// Phương thức chính
func main() {
// tại đây gọi hàm này
// hàm trả về hai giá trị
m, d := calculator(105, 7)
fmt.Println("105 x 7 = ", m)
fmt.Println("105 / 7 = ", d)
}
// hàm có các đối số được đặt tên
func calculator(a, b int) (mul int, div int) {
// tại đây phép gán đơn giản sẽ
// khởi tạo giá trị cho nó
mul = a * b
div = a / b
// tại đây bạn sẽ có từ khóa return
// không có bất kỳ tham số kết quả nào
return
}
Result:
105 x 7 = 735
105 / 7 = 15Important Note:
- If the types of all the return arguments are named in common or are the same, then you can specify a common data type. Compare the code below with the example you read above to understand better.
// hàm có đối số đã được đặt tên
func calculator(a, b int) (mul, div int) {- Here, the variables mul and div are both of type int . So you can also declare named arguments with generic data types as function variables (i.e. a and b)
- Using named return parameters enhances code readability as one can know about the return parameters just by reading the function signature.
- After using a named return parameter, the return statement is often referred to as a Naked or Bare return .
- By default, Golang defines all named variables with a value of zero and functions will be able to use them. In case the function does not modify the values, a value of zero will be returned automatically.
- If you use the short declaration operator ( : = ) to initialize named return parameters, it will throw an error because it has already been initialized by the Go compiler. So you can use simple assignment ( = ) to assign values to named return parameters.
// hàm có đối số được đặt tên
func calculator(a, b int) (mul int, div int) {
// tại đây, nó sẽ báo lỗi
// dưới dạng tham số đã được xác định
// trong chữ ký hàm
mul := a * b
div := a / b
// tại đây bạn có từ khóa return
// không có bất kỳ tham số kết quả nào
return
}- Named return arguments or minimal return statements are only good for short function signatures. For longer functions, explicitly return the result parameters (don't use named return parameters) to maintain readability of the code.
- In case of named return arguments, a minimal or simple return statement is required.
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.
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 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.
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.
How to Fix Microsoft Teams Error K Security
Struggling with Microsoft Teams "Error K" Security? Follow our step-by-step guide to fix it quickly—no tech expertise needed. Get back to seamless collaboration today!
How to Fix Microsoft Teams Update Error 0x80070002
Struggling with Microsoft Teams Update Error 0x80070002? Discover step-by-step fixes to resolve it quickly. Clear cache, repair files, and get back to seamless updates today!
Solving Microsoft Teams Web Error Browser Login
Tired of Microsoft Teams "Web Error" blocking your browser login? Follow our step-by-step guide with proven fixes to resolve Teams web login issues fast and securely. Get back to work!
How to Fix Microsoft Teams Error O Offline
Stuck with Microsoft Teams "Error O" Offline? Discover proven, step-by-step fixes to get back online fast. Clear cache, restart, and more – no tech skills needed!
Where is Microsoft Teams in Outlook? Locating the Missing Icon
Frustrated by the missing Microsoft Teams icon in Outlook? Learn exactly where to find it, why it disappears, and proven steps to restore it for effortless meetings. Updated for the latest versions!
Solving Microsoft Teams Windows 10 Error Login Issues
Struggling with Microsoft Teams "Windows 10 Error" login issues? Get instant fixes for cache clears, updates, and more. Step-by-step solutions to solve Microsoft Teams login error on Windows 10 fast and frustration-free.
Solving Microsoft Teams Website Error Tab Not Loading
Tired of the frustrating Microsoft Teams "Website Error" where tabs won’t load? Get step-by-step fixes to resolve it quickly and boost your productivity. Essential troubleshooting for seamless Teams experience.
How to Fix Microsoft Teams Web Error 503 Service Unavailable
Tired of the frustrating Microsoft Teams "Web Error" 503 Service Unavailable? Discover proven, step-by-step fixes for Teams 503 error on web. Get back online fast with our expert guide. Works on all browsers!
How to Fix Microsoft Teams Win 7 Error Compatibility
Struggling with Microsoft Teams "Win 7 Error" compatibility? Discover step-by-step fixes to restore seamless video calls and chats on unsupported Windows versions. Quick, reliable solutions inside!
Troubleshooting Microsoft Teams Breakout Rooms License Errors
Master troubleshooting Microsoft Teams Breakout Rooms license errors with this step-by-step guide. Quick fixes for common license issues, admin checks, and prevention tips to get your meetings running smoothly.
How to Fix Microsoft Teams Version History Error
Struggling with Microsoft Teams "Version History" Error? Discover proven, step-by-step fixes to restore access instantly. Clear cache, update Teams, and more—no tech skills needed!
Solving Microsoft Teams Joining Error: Meeting ID Not Found
Tired of the frustrating Microsoft Teams Joining Error: Meeting ID Not Found? Get step-by-step fixes to rejoin meetings fast. Updated with the latest Teams patches for seamless collaboration. Solve it now!
Troubleshooting Microsoft Teams Video Error Green Screen
Struggling with Microsoft Teams "Video Error" green screen? Discover proven, step-by-step troubleshooting fixes for seamless video calls. Quick solutions inside!
How to Fix Microsoft Teams How Teams Works Tutorial Error
Struggling with the Microsoft Teams "How Teams Works" Tutorial Error? Discover proven, step-by-step fixes to resolve it quickly. Clear cache, update, and more for seamless onboarding. Works on latest versions!
How to Fix Microsoft Teams Error Today on Windows 10
Tired of the frustrating Microsoft Teams "Error Today" on Windows 10? Discover proven, step-by-step fixes to resolve it quickly and restore smooth teamwork. No tech skills needed!