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.
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.
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.
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.
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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.
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